This is so retarded.
There is no reason for the MC to be such an insecure wimp, after he clearly has witnessed many times before, himself basically being the strongest person of all the people he has met so far. Also he is very sensitive to take bad influence (as in, becoming even more insecure/timid), from all the weaker chicken shit adventurers, who make decisions based on their own (very much weaker) strength, and they value their own lives above anything else (which in it self isn't wrong).
I just think that the author who wrote this, chose his protagonist's persona very badly. It's clear he's supposed to be the carrying force of a manga like this (where we don't have a bigger cast of several main characters), but instead he ends up being the worst/weakest part of this whole manga, smh.