I would argue that all of them were in defense of our national interests on some level.
The reality lies somewhere between the pacifist/isolationist bent of you and the OP and more hawkish “just let the Marines go kick ass” positions of people like GloryDays.
In the past, the US has adopted isolationist policies thinking that trouble abroad was just a “Europe problem”. We didn’t formally enter WWI and WWII until we were forced to.
Since WWII (specifically the invention of the atomic bomb) American foreign policy has largely been about trying to head off and isolate minor conflicts before they turn into another global war which could ultimately bring two nuclear armed countries into direct conflict.
To an extent, it is also a main reason why nearly every conflict since WWII has been a clear victory for one side or the other and just seem to simmer along half-heartedly for decades.