. . . that undocumented immigrants are not "criminals" and that they commit fewer crimes than the standard US citizen. That this keeps coming up as a point of amazement or of argumentation shows a repeated failure to understand how the MAGA GOP authoritarians look at all of these immigrants.
"The worst of the worst...murderers...rapists..." is just a talking point to lend a more strident, emotional weight to arguments which attempt to justify all these removals and which serve to quiet crowds against protesting the removals broadly, loudly, or openly.
Principally, the MAGA GOP sees all undocumented immigrants as criminals for crossing the border or overstaying, and it does not matter to MAGA how long they have been in the US, how they have conducted themselves (unless it actually does involve lawbreaking), why they came here, or what any other of their circumstances actually have been.
This is very similar to the attribution of original sin to humanity--except in this case, MAGA attributes this "original sin" to all Latinos and other non-Caucasian groups. The MAGA GOP's actions may well be likened to ethnic cleansing, since it is (at a fundamental level) a seemingly due-process-free backlash against the broken immigration policy and economic system that has been present since at least the time of Reagan.
Will the economic circumstances be fundamentally changed so as to avoid this sort of situation in the future? That is doubtful: who benefits the most from the continuation of cheap labor? Do they have any interest in fixing that "problem", or is it a convenient means to divide the masses of poor people against themselves? Has Trump ever employed undocumented immigrants? If so, that would indicate that even he does not really care about this--it is likely just a means to an end (i.e., his regaining the Presidency and the ability to continue to grift from that position through other means--cryptocurrency, etc.).