I'm sorry to hear that. libCurl is great and my life is better for it. It's really best to not reply to the mentally ill people (and you can be pretty sure anyone sending something like the first is at least temporarily mentally ill). It can sometimes be extremely tempting, I know-- especially when they've managed to say something almost perfectly constructed for pithy comeback. But it will not help you and it will n…
This IMO is the best way to deal with a lot of emails. I have some public software that is literally innocuous, and yet occasionally I get some very angry emails. An example: a small game where people think the game/computer is cheating (it's not).
If someone fires off an angry, irrational email to you, they aren't looking for a rational response - they are looking for a debate, or a fight, or an outlet. It's best to let them move on.