Seeing obese people eat makes me angry.
That's odd. Why do you get upset by people eating?
I don't want them to live a long time.
They need to eat to survive. You shouldn't want them to die just because they weigh more than you.
They live too long. It's wrong. Some people don't deserve to live.
Wanting people to die is a horrible way to think. Everybody deserves to live and to enjoy their life, regardless of their weight. You really need to stop judging people so harshly for their weight.