He lacks confidence. It might be the most glaring of his issues. This isn't all that uncommon; we all have varying amounts of self-confidence, and there is a threshold where we won't react very well. We either give in, or we lose control. For most people, this happens on a relatively small stage, since we do not seek out such broad attention.
If you're trying to be a public figure, the lack of self-confidence is a time bomb. Evans has dealt with issues by bullying people and trying to force them to back down. This is not the approach of a confident person. And when it doesn't work, he lacks the confidence to recover. Hence the continued attempts to either bully people or elicit sympathy from his dwindling support network.
And it will continue to dwindle. Once your lack of self-confidence is on display, it's very difficult to recover. No one wants to follow a person who doesn't believe in himself.