Like always, the left’s problem is that their proposed solutions read like they were written by teenagers, based on emotions and dismissive of the reasons why their supposed “enemies” disagree with them.
Most Americans would support having ICE operate perhaps even entirely with nonlethal weapons. That would be a smart thing to push for! And popular too. But the party line is instead “Abolish ICE.” And of course nobody (who isn’t pro-open-borders) trusts that there’s any Democratic plan besides look-the-other-way and maybe amnesty.
It was aggressive, it was inhumane, and immigrants were killed despite a massive effort by people from "the left" to feed and clothe people who were detained in open fields or between two border fences without any care being provided by the US agencies detaining them.
Maybe you are right that nobody who is right-leaning trusts that the US democratic party isn't pro border enforcement and anti immigration, but that's based purely on lies and propaganda.
Whoever told you this made it up. You should stop listening to whoever told you that. They are lying to you about this, and everything else they have told you is a lie too.