u/ComprehensiveBasil61

So, as the title says, I have a player in a game of mine that brings the vibe down, as he is so terrified of consequences that he is mostly unwilling to do anything. It has gotten to the point where he has begun berating the other party members, both in and out of character, for doing things that he deems to be mistakes. Regardless of whether or not they are. He also complains constantly in combat. So I want some advice on how to handle this problem without having to dismiss him from the table. He is a good person, and I enjoy being around him. This problem is basically just when we play. I hope you guys can help me. Feel free to ask for more details if needed.