You seem to not understand the disconnect.
The average millennial and Gen z watched America bumble into 2 wars that produced nothing and raised the national debt by trillions of dollars.
Then they had to watch as billions of dollars in their tax money went to a country that didn't do shyt for them. They do not see Israel as an "ally" moreover, they have an understanding that many of America's foreign policy problems are blowback from years and years of absolutely dog shyt foreign policy that only put military contractors and oil companies first instead of American people.
Veterans were told they were going to Iraq to stop a dictator who had weapons that DID NOT EXIST. They were told they were going into Afghanistan to find a man that WASNT THERE. These young people grew up watching Americans put their lives at risk for nothing. We didn't make our money back, and those veterans were treated like shyt when they got back by the same government that was supposed to compensate them.
People are asking "why am I supposed to accept that there's no money for climate change, Healthcare, child care, a federal high speed rail network, but every year my fukking tax money that I break my back for is going to some a$$holes who are obsessed with killing their neighbors and their children?"
And your response boils down to "well because we said that we'd help them! So their problems are our problems"
That isn't a response that anyone with basic critical thinking skills will accept. This is a "because I said so!" Type beat, and this is a generation of adults that fukking hated hearing that as kids so they sure as shyt won't accept that as grown adults who grind every day just to survive. This isn't 1955. The cold war is over. This isn't 1942, none of these Arab countries have the capability Germany had. America hasn't been involved in a "just" war since WWII.
They do not want kids being killed with their tax money. The only people that have a tough time understanding this are people who don't see those grieving parents and dismembered children as human beings. The only people that this is complicated for is people who benefit from the status quo.