because the other option was a pseudo nigger woman who supported troons, and a majority of them are some kind of catholic and still have some testosterone. he doesn't actually want to shut down immigration, he and elon are both salivating over accelerated "legal" immigration making it easier to flood the streets with pajeets and their ilk. and if you're an illegal that got naturalized, obviously you'd love to close the border, why would a lawncare guy want a steady stream of newer, cheaper lawncare guys coming in? they don't care about the cartels, if he wants to go after them fine, nobody is suggesting they would buck because of that. the problem is that in order to effectively fight the cartels, you'll need to do things that will inevitably kill mexican civilians, which will in turn end up on the news, be weaponized to turn mexican votes back towards the democrats, and to avoid that end he and the gop will tie the hands of any operation in mexico. there's all sorts of other angles that make overemotional redditors here really upset like the mexican 5th column in every military unit, the retaliation, the terrorism, but just the politics of it make it infeasible. this makes the "just use the drones bro!" call of duty guys really mad, but that's the reality of it.
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