The common man is not relevant at a geopolitical stage. The common man does not represent the US. Common man in the US is a 60% white polarized mutt with an IQ in rapid collapse and dependent on multiple psychotropic drugs while eating shit food and having 30BMI. Sorry to say but this average person, often seen riding some fatmobile in a store or MAGA rally, is a lost cause.
Now for what actually matters, Geopolitics and POWER.
From an idealistic perspective that should work for shitlib biomass, the US is fighting against an authoritarian Russian regime that's dangerous to democracies nearby.
From a neocon/neolib perspective, the US is weaking one of its two main competitors at the tiny cost of like 7% of the military budget or something. It's also a good opportunity to revive NATO and increase the cohesion of the US-Europe alliance, while distancing it from Russia.
From an economic perspective, the US will rebuild Ukraine and put all its corporations in it and open up another US-aligned market in the area.
From a military perspective, the US gets to test its weapons against the Russian forces, which is extremely useful. It also gets to observe the Russian military and Wagner, hence the AWACS in the area monitoring 24/7.
Again, still curious what mask you thought I was metaphorically wearing?