Well, if you're a US citizen, you're involved because billions of your tax dollars are going to fund Israel. Israel is committing a genocide funded by my money. I am unfortunately, partially culpable.

when something good happens you boast about upholding the values of democracy, liberty, and how amazing the "international community" and the international law is, when a disaster happens, suddenly the "civilized western/eurocentric values" disappear

You’re right. The answer to why is that suffering innocents should bother us, and we should take a sensible approach to reducing it. My point is that I’m not sure that means taking sides in their contest of who can be the least humane can any longer be presumed to be the sensible approach.