... some glum, drunken, disapproving monster ... (Alice Thomas Ellis)
One does not need to be drunk to be glum and disapproving.
These two bookending traits can persist for years, for decades, into recovery and might, arguably, be the two character defects.
If one were not unhappy, if one were not the 'chief critic', the resenter-in-chief, there is little (although not no) ill that could flow.
Resentment is the number one offender precisely because from it flows all else.
Upstream of both glumness and resentment are selfishness.
Cheerfulness and acceptance, are the antidotes.
The upstream antidote is selflessness.