Surveys repeatedly show that the public have a very poor grasp of facts overall, including key national indicators. They are likely to be heavily inaccurate on virtually all topics that they care about: immigration, economy, crime, etc. and this is well recognised. For instance, you support a party where ~70% of its voters believe Biden's win was illlegitimate, around half of whom even think there is hard evidence it was illegal.
Even the smartest people are likely to make serious errors if they base their decisions on false and inaccurate data.
The election in which Biden won Pennsylvania was in violation of our state constitution. It's more surprising that half of Republicans don't see that it was illegal.
I haven't given this list in a while, let's do it again:
1) Absentee voting is established in the state's constitution for "qualified electors who may, on the occurrence of any election, be absent from the municipality of their residence, because their duties, occupation or business require them to be elsewhere or who, on the occurrence of any election, are unable to attend at their proper polling places because of illness or physical disability or who will not attend a polling place because of the observance of a religious holiday or who cannot vote because of election day duties, in the case of a county employee". The Supreme Court of PA (which is an elected position and they all have party affiliations) decided on a party line vote that "We find no restriction in our Constitution on the General Assembly’s ability to create universal mail-in voting." Two major problems with that decision: first, in order to reach that conclusion, they have to read that section as an unnecessary list of potential reasons to absentee vote which requires no reason; second, the General Assembly didn't create universal mail-in voting. The year before, they had passed election reforms that broadened the scope and eased restrictions on mail-in voting, but that law still required applicants to "POSSESS QUALIFICATIONS OF AN ABSENTEE ELECTOR" (caps from the bill itself in all caps, not meant for emphasis). The governor and secretary of state turned it into universal mail-in voting, and the Supreme Court decided this was in the spirit of the law that was passed, and could have been passed if they wanted to.
2) By law, absentee ballots in PA can legally be requested and submitted at the county elections office, either by mail or in person. There is no provision in any law to allow for dropboxes or "satellite election offices". The Democratic run executive branch, not the legislature, decided these should be a thing in 2020 and then created them in only major Democratic strongholds. Pennsylvania in 2020, by the actions of the governor and secretary of state, had de facto early voting and ballot dropboxes for only blue counties. Republicans sought to have representatives present at these locations, to be assured that no fraud was being committed (as every Party is legally entitled to at polling places on election day) and they were kicked off the property. They made early voting in only places that are >2/3rds Democrat and then only let Democratic campaign representatives see what they were doing there.
3) Despite the efforts above all being justified by covid, when the State was petitioned to assist elderly voters, whom the Secretary of Health was still telling to not leave their homes, the only response was that they'll figure out mail in voting. Apparently drop boxes are necessary to keep people safe from a pandemic on the streets of Philadelphia, but doing the same for a retirement community (who are way more at risk of dying but are demographically likely Republican voters) is just unreasonable, we can't help those people vote. The Secretary of Health making these decisions is now the US Secretary of Health, rewarded for the blatant partisanship.
4) The Democrats removed the Green Party from the ballot so that they wouldn't take votes away from Biden. The state accepted their petition to be on the ballot, then only after the deadline to submit, Democrats discovered (they run the office, they knew the whole time, they didn't tell the Green Party until it was too late on purpose) that a form that required hard-copy signatures was faxed in. When this went to court, the judge essentially said "were you told you were missing this form? No? Do you still have the physical signatures? Yes? Give them here, you're on the ballot." So the Democratic Party of Pennsylvania appealed to the Supreme Court of Pennsylvania who decided (again on strict party lines) to kick them off the ballot.
None of this is wild conspiracies, it was all done out in the open beforehand. If you remember on election night, you were worried PA was going to Trump, and I assured you that it wouldn't last the night, they hadn't counted the early votes in Philadelphia yet. We knew here in advance of the election that Democrats at the state level were abusing their positions to tilt the scales in their favor at every opportunity, legal or otherwise. 1000% rigged.