It's a matter of priorities.
I'd prefer Trump focus on purely domestic issues.
Stop protecting Ukraine and Israel. Stop bullying Denmark and Greenland. Leave Venezuela and Cuba alone.
Focus on the U.S., not the world.
Now, I admit, that is good advice. And I am not being facetious.
We should protect ourselves from people who have been screaming at the top of their lungs for the last half century:
"DEATH TO AMERICA"
And not only have they threatened it, they have killed thousands of American citizens over that time.
I do believe you are correct in this. We absolutely SHOULD protect the U.S. from those threats of wiping us off the face of the Earth.
Of course, if it protects Israelis and the rest of the world too, that is an added bonus.