Avengers vs X-men springs to mind
OK basic premise is the Phoenix is coming to Earth looking for a host and it's extremely obvious to every hero who that host is going to be, which is a young mutant named Hope. Now the Phoenix is a all powerful comic entity, so it's not all that surprising that the Avengers is scared about that thing coming to Earth so they want to take Hope into custody, (despite doing nothing wrong, common theme of this story) and........hide her somewhere....Anyway obviously the X-men aren't too keen on that idea since Hope is supposed to be their answer to their dying species, so to war!
Back to the topic at hand, the Avengers plan like I said above, was to take Hope from the X-men home, by force if necessary. To be fair they did try asking nicely for the X-men to hand her over, and by nicely I mean bring about 95% of everyone that was ever a Avenger along in case the X-men said no.
Now some of you might be asking: Um, what did the Avengers plan to do if they actually got what they wanted? I honestly have no idea, it feels like one of those ????? Profit!! sort of things. Maybe they were hoping if they stuck in a basement and kept reaaaaally quiet the super powerful being that can find whatever it wants would just fly away. *SMH*
The funny part is the Avengers end up looking even worse later. Through some craziness instead of Hope the Phoenix picked 5 different X-men and split it's power 5 ways. And from there they used their new powers to make the world a better place. From the wiki they gave "free energy, food and water to all humanity as well as ending armed conflicts around the globe." Wow, that sounds pretty sweet. But the Avengers has to stop them from going to far, so they kidnapped Hope since they think she's the key to taking the Phoenix-powered X-men down, which of course gets the X-Men all POed so they start fighting again, you know instead of the whole make the world a better place thing they were doing before. I bet if they left them alone for a few days longer and they probably would've found the cure for cancer,
Now here's the thing that grinds my gears, the X-men didn't do anything wrong at this point in the story or even look like they were going in that direction, all their actions were great and really beneficial to the entire world. But the Avengers took action to take down anyway despite them doing nothing wrong. Which in turn restarted their war(the fighting stopped once the 5 X-men go their new powers) and of course destruction and mayhem followed.
I'm not saying that the Avengers should have done absolutely nothing, the story was obviously going the "ultimate power corrupts" route so eventually they needed to do something. But if they've waited until that actually happened they would at least have good reason to take action, where instead they just jump in and start kicking ass with "They have to be stopped before they do something!" as their reasoning. Like seriously, imagine how screwed up the world would be if the cops acted like that? (I'm sure there's cases where they do but there's differences between those and what happened here)
Overall the writing was pretty bad for this mini-series, but man did they make the Avengers look terrible. It was even sadder when they tried to make the X-men look worse by comparison so the Avengers would still look good, but really that felt like they realized how badly they screwed up and tried to cover it up. So while I'm sure seeing Avengers fight the X-men sound great on paper, in reality it was garbage.