Wanting Nothing, Competing with No One

Well, I've seen that many time-travelers are cautious. Can our protagonist really survive if he is so careless? Is it really okay to trust people casually? Are you afraid of being burned when you reveal your identity to someone you have known for a short time? Perhaps the protagonist feels that there is no need to fear death in this world, and even thinks that he can only go back after death? Or is the protagonist really crazy?