You're right, there are no "guarantees", but nopara73 also can't just wait for a government agency to sanction WasabiWallet, and have the police come to his home and arrest him. He accepted the trade-off to keep Wasabi's pool "untainted", and probably hope that he doesn't get arrested.
I feel like you are trying to justify the wrongdoings of the Wasabi team
But he only had two paths, shut Wasabi down, or block tainted outputs. He chose to block tainted outputs.
He could have handed over the project to someone else (it is open source after all) who is not under the same possible threat so that they could continue the project. Or at the very least they could introduce more decentralized option into the project and most importantly be clear about the anti-privacy things their own coordinator server is doing.
Guess what, if they did that they would have stopped making money!!!