I'd be very surprised if ANYONE could. Envy has no excuse other than the fact that it was all part of Father's plan... and it all amounted to nothing, in the end.

Human!Envy's struggle for meaning is very much like Rose's, after Father Cornell's miracles were revealed to be nothing more than a fraud. He'll be looking for a reason to live. Attempting to make up for all the evils he committed as a Homunculus will certainly be part of that journey.