I think that @o_e_l_e_o and @20kevin20 said correctly why mixers should exist legally and they changed my mind. In what I really agree is that banning them, doesn't mean that it will damage the criminals. They will find another way like monero etc. So yes, since privacy matters, then mixers matter too.
While i agree with everything that's been said here, the problem in these type of situations is that government's often don't care about this. Most end up taking a heavy handed approach to these issues and push out or at least attempt to push out bans even when they know themselves that such bans will be difficult to enforce. It doesn't matter to them that criminals will always manage to find away around their bans and it is always the average user that ends up bearing the brunt of their arbitrary laws.
Take Tax laws as an example here. Most states try to impose heavy penalties including imprisonment etc for non payment of taxes, late filings etc. Again this is done to deter criminal and large organizations yet most times its the little guy that ends up getting targeted or bearing the brunt of these laws while the larger entities who can hire the best lawyers ( or the best options that money can buy depending on what scenario we are talking about) will often find a loop hole around the problem.
Mixers are legal because it is suppose to be used in legal way, hiding your real identity and for privacy of transactions. Some people are just taking advantage of it using it to launder money and even scam people without getting traced using mixers.
Yes, I agree, but as a conclusion of the posts above you, you can use a knife to make a great dinner or to kill someone. It doesn't make the knife illegal, but the person who uses it to murder.
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Yea the thing with any technology or anything for that matter is that some people will try to use it in a way that society does not deem appropriate. That however does not mean that any fault lies in the product only in the entity using it.