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In Town of Salem, you can continue to investigate until the town loses. And in general, the game should be played in a more relaxed and enjoyable way.
As for Tox, you can simply observe his statements and votes throughout the day to understand that following such a person could be dangerous for the town. And it's not even about him being a Mafia member, but about his erratic behavior. He simply confuses the town and makes assumptions about game-related or non-game-related moments, which are based on unclear grounds. Maybe 7 years ago, it was possible to identify some players based on their psychology or activity, but that time has passed. And there is evidence. If you don't like long chains of reasoning, I've found a shorter piece of evidence, again pointing to Nefel. If none of the available evidence is satisfactory, then the issue lies with the players.