A bigger question is whether or not this is necessary to be a super power. There has never been a super power that did not do this. We can argue good or bad till we are blue in the face, but if it's a necessity, then it's going to happen. Even if the necessity is just to become a global dominant power.

An easier example to understand is selling military equipment that will absolutely be used in genocides. You can't be a super power if you don't sell advanced military equipment. Inevitably, some of those you sell to will be using it to murder journalists for reporting about the line.

So, yeah selling them those weapons is bad. But if you don't do it, someone else will. That someone else will gain inordinate amounts of power making sure your country will never be in power. So we sell, we sell it as we watch Palestinians burn.