While serving the jews is definitely a factor, there is a cold geopolitical motivation behind the war, even if most of the public don't know or care about it, neutralizing Iran as a threat would be ridding America of one more sworn enemy, Russia and China would effectively be the only ones left.
The ultimate fate of MAGA still depends how the war shakes out, if it ends in victory in a short time frame (a few months at max), it would be fine for Trump, if it goes long enough, or god forbid, we don't achieve any of the substantial goals before withdrawing, that would end him and any possible future MAGA has in mainstream politics.