Also, saying that a criminal is more likely to use a privacy tool than the average person doesn't say a whole lot about non-criminals who use them.
Also, one of these measures seems to be remarkably "once a criminal always a criminal", therefore probably significantly over-estimates the number of criminals.
I wasn't even going to comment on it but someone seemed so confident in these dodgy numbers, seeing something that isn't even really there. Anyway, if you're ever unfortunate enough to encounter these arguments, then you know their flaws, I guess.