He could have asked for charity, or asked hi multi-millionaire grandfather or fabulously wealthy family for help, or sued the insurance company, or taken out loans, or made a ton of money of his own and paid cash and negotiated directly with the providers, or mortgage the family mansion, sell everything he owns. There are millions of things he could have done.
"Nothing you can do about it" is just a lie people tell themselves to justify violence.
Well, it fixed a perceived wrong.
Oftentimes injustice is what actually hurts.
I do believe, though, that there is a vast spectrum of behaviours in between non violent inaction and an isolated random killing, that make a lot more sense in every way and that is called politics.
"Nothing you can do about it" is just a lie people tell themselves to justify violence.