kanoi- we can argue what milchemes mitzvah is but certainly protecting Jews from their enemies iscertainly that (check the Rambam)
Your second point about the family being fed is sophistry. To feed one’s family, you must have a paying occupation- not rely upon the others. Check gemoro brochos (mentioned) that clearly indicates that to learn forever is for a very select few ( to which I agree). the shutfos of Yossochor uzevulun indicates as much. No one denies that for a select few, the learning model is genuine and should be supported. these are the dayaonim of the future. The problem is that now, EVERYONE eats at the public trough. That is a recipe for financial disaster.As far as why israle hasn’t reliquished american aid- there are many israelis who say exactly that!