People are using the system for these reasons. Vitalik himself has gone on record saying he has used Tornado Cash to donate large sums of money anonymously to Ukraine.
lol, the goalposts have shifted from “nobody uses it for this” to “we can’t know if people use it for this.”
Imagine applying this logic to E2EE chat: we can’t know if anybody is using it for legitimate reasons, because we can’t see their messages.
Besides, you can check the chain yourself - if Vitalik is truthful, you should see at least that some tornado linked funds have been donated to Ukraine after the point he placed them in the protocol.