I don't even think it was that altruistic. I have a saw, and a ladder. I could have risked myself to try to remove the tree and fix up the roof... Not to mention the potential lawsuits from screwing it up, since I'm not trained in tree removal or roof repairs, or getting arrested for trespass for messing around in a house I don't own.
I put in an amount of effort to satisfy my own concerns about how devasted I would be if my house was destroyed and no one even lifted a finger to let me know about it before I got home.