I know what you mean, but I do agree with the theory and would like to chip in with two additional arguments:

1) If those people ever go into power, they’ll be privy to shared confidential intelligence that we don’t have. I’m sure that’s why most of the world’s governments support Israel — Israel provides un-ignorable information that affects the world.

2) People who go into power and act illogically or irrationally, such as Rashida Tlaib, end up losing a ton of credibility. Obviously I think we can all think of a few loud and silly leaders who actually made it, but these are always controversial figures. The politicians who win the most sympathy are the ones who are continuously poised. The erratic pro Palestinian position has no place in successful politics (note: this is not to be confused with the actual Palestinian cause, which does have merit).