My husband believes he is a 'bad person' that he hurts everyone around him that he fails them constantly etc....

When the truth is he is a loving caring father and husband, his perception is way off base ! And no matter how much I tell him the truth when he is feeling down up his insecurities pop to attack him. This makes his thoughts no less real just wrong.

Perhaps you see things the way he does when in fact you are a kind caring person so much so that you worry about it and type a thread on here which to me says I am right and you are a caring person.