This shouldn't have to be said but apparently it does. I don't think conspiracy to launder money and circumvent sanctions magically becomes legal just because one ingredient of doing that is publication of math.
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The developers of Tornado Cash simply published open source code. It's decentralized and they don't have any control or involvement in how it's used. A developer was arrested for writing and publishing the code. It still works and isn't shut down in any way despite bad reporting.
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Tornado Cash, Zcash shielded transactions, Monero, etc. provide an alternative to having all your financial transactions publicly visible. They support view keys which can be used to prove where the money you put into it went if you need to do that for compliance.