I'm more than happy to go through that list, but I suspect I will be downvoted anyway for merely explaining my own beliefs (which is what you are asking for)
- Ukraine - a contrived proxy war and we are very generously and bravely assisting in the avoidable deaths of as many Ukrainians as possible. I'll go even further - neoliberal support in the US is comes from this notion that Trump and Putin are penpals, so if we punch Putin, its like punching Trump
- Middle East Wars - worst geopolitical decision since ww2, probably ruined the US forever
- Vietnam - a massive mistake...and I mean MISTAKE. this was not evil on the US part, but a legit misunderstanding. We mistook a civil war for a Red Wave
- Korea - neutral...but it was the last time we faced off against China militarily and although we massively outgunned them, they probably delivered the single worst military defeat in US history (Chosin Resevoir). By any rational assessment we should have demolished the Chinese, instead they demolished us.