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I have read your post with great interest, and I can see the heavy moral questions that arise from your internal debate. However, is it true that a catalyser to your decision, was in fact a claim made by US law enforcement?
I think Bitcoin gives us the power to decide whether you want to be public about your stake in it or not, and this is quite a primal right every individual should have.
For example, what if a guy from the pizza shop or some taxi driver i just payed with my bitcoin wallet, would know that I hold 10,000 BTC?
How many dangerous situations that would create?
Would I ever be able to use my crypto wallet safely (not from hackers, but from street criminals) again?
That's one reason Monero exists. Nobody should have to worry about the clerk they just paid seeing their balance and deciding to pay them a visit later with a crowbar to "pry"out their private key from them. Privacy is good for everyone, not just criminals.
For those who want to go against the advice of the OP (Bitmixer) and still think Bitcoin mixers will make them private, please see
https://bitcointalk.org/index.php?topic=2042470.msg20383605#msg20383605