I'm starting to see this everywhere. "There was no due process when illegal immigrants hopped the border" and "Laken Riley didn't get any due process" are widespread talking points at this point. Kavanaugh talks about how the goal of the criminal is to evade the law when considering the balance of equities in his concurrence on racial profiling in ICE stops.

I've even seen comments here and on reddit of people saying that the exclusionary rule should be eliminated, since if somebody is a criminal they shouldn't get constitutional protections.

It is worth remembering that the idea that the constitution seriously protects even those who really did crimes is pretty radical. Things that we consider to be baked into our judicial system (the exclusionary rule, miranda warnings) are not terribly old and were extremely controversial when first established. Congress passed a whole law saying that Miranda v Arizona was invalid (which they don't have the power to do). This means that we need active work to protect it.