I don't think I might have to  hate mixers because of this. It is just like if I lost my fiat currency weather it got stolen from my bank directly or as cash or any other way, this doesn't mean I will hate all bank or that particular one except they were at fault and all these are when it is unfortunate to trace the missing fiat. And this is similarly possible in fiat, there are ways criminals can still be able to cover their traces on fiat especially when the fiat are in cash i.e physical form.

This just also showed there are chances of this happening in our fiat currency and we likely won't hate it and so seeing it from this angle also helps to see that fiat currencies and digital currencies like bitcoin can be used by criminals and mixers is just one ways they could do this but we just can't let the cons overshadow the good part of it.