It's not that miniscule. The manufacturers advertise their products as 98% effective, I won't bicker over calling 2% miniscule, I think that's fair, especially since that statistic is an annual failure rate for an individual, not for a single usage. But that's not what we're talking about, let's pull some statistics:
-Preventing pregnancy with consistent, correct usage: 98%
-Preventing pregnancy with typical usage: 85%
-Preventing HIV transmission through vaginal sex with correct, consistent usage: 85-90%
-Preventing HIV transmission through anal sex with correct, consistent usage: 70-87%
www.ncbi.nlm.nih.gov
Though many methods of prevention of STI/HIV are available, condoms remain of utmost importance. They have gone a long way from the oiled silk paper used by the Chinese and the hard sheaths made of tortoise- shell used by the Japanese to the latex ...
www.ncbi.nlm.nih.gov
ale condom effectiveness during anal sex between MSM in 2 prospective cohort studies of HIV incidence by self-reported consistency of use. Methods: Analyzed data combined from US participants in the EXPLORE trial (1999–2001) public use data set and in the VAX 004 trial (1998–1999) data set...
journals.lww.com
Those numbers are not being advertised, and people may be convinced to adjust their behavior in other ways if they know it's not 98% effective, it's 70% effective. Going by
these risk estimates, that leaves anal sex with a condom still pretty risky per event. 1.38% per act, even divided by 4, means if you had anal sex twice a week while HIV positive, there's about a 30% chance you infect someone each year, even if you use condoms carefully every time.
That's not miniscule. That's substantial. And maybe if you took opposing perspectives more seriously, you'd have known that already.