The purpose of mixers is good, they help you to increase your privacy but the problem is that probably majority of users use them for illegal activities. Even if 1/3 of their users use it for illegal activities, it's enough to convince people that mixers are bad for everybody.
There is no statistic that can support how many people use it for illegal activities or how many use it just for protection of privacy. Because aside from there is too much anonymity for there to be a concise conclusion. Besides after they use the mixers, we do not know where the tokens go anymore.
What do you think, which politician wins elections, A) The one who talks about how billions of dollars are laundered through mixers and how should we can them for a better future or B) The politician who talks that despite the fact that some people use it for illegal activities, we shouldn't ban them because they help people to keep high privacy.
I think B loses without a chance.
Well, even though Trump never mentioned mixers he still won the election by using cryptocurrency on his side. Time has evolved so there might be more supporters of privacy and anonymity now.