Would you stop at nothing to save the world?

I’m currently watching a movie,
in this movie the main character (just a regular joe) is being haunted by..something that is trying to take over or destroy the world. Now the “hero” is stopping at nothing to stop this threat,
now
-he left his job (no more income)
-he is driving around like a madman (alot of damage to his and other vehicles and property)
-he is being chased by police(because they don’t know what he’s doing, and he’s blowing shit up)
-he is flying all around the world(maxing out his credit cards)

now in the end I assume he will win and stop the threat and live…
If So:
1-He has no job
2— The Police are still looking for him (most likely a manhunt)
3— He is in massive debt
4— His insurance has skyrocketed
5— Everyone will think he’s nuts if he tells what happened (no proof)
6— He has no money

Now it’s not that he doesn’t get treated like a hero for saving the world but that his life now is Fu@k*d over… I need help understanding these types of movies, does it have something to do with “the ultimate good deed”, or that anyone can be a hero, or self sacrifice for the greater good or something???