maybe you've been watching too many movies or reading too many comics if you think that anti-fascists are only in the fight because they're jealous and have meaningless lives.
perhaps anti-fascists see the fight for a just and equitable society to be more than that. the people i've worked with who organize for a better society don't tend to live lives like you see in a movie or comic. they're out there feeding the homeless, starting scholarship funds, and teaching people how to garden.