If you know the kind of frivolous lifestyle these guys live without care for what the money is being used for, if it is to fund terrorism to wipe out a whole city, they don't care, it is about the gain. Some of those they mix for will even bargain a good percentage with them before the deal is pushed through, so this is not about what they deserve or not, it's about the law. If the law exenorate them, fine.
I am not against mixing, it is advantageous, but the selfish and wicked human nature. It's easy to say you want to mix your coins for privacy reasons and anonymity, bla bla bla.
You are just inventing things you have no idea how they are living, these are not arguments but just a show of your envy.
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It is unfortunate to hear that as they definitely don't deserve this. However fighting the US government on such matters is pretty much impossible. They will get you if they want to and every conviction establishes more precedent.
Why don't they deserve it? They should know the risk they took and the possible consequences thereof.
Do gun producers get into jail because someone uses their guns to commit murder? They don't. To makes things worse a mixer is not even a physical object, it is code, and code is speech. They don't deserve this, they didn't do anything wrong.