Biologically there are 4 things people are driven to do with enough drive to have created 8,000,000,000 people alive today. 

1: Breath
2: Drink water
3: Eat food
4: Reproduce 

Good luck telling people all they have to do is not do what their hormones are driving them to do. Abstinence only education works so well to prevent teen pregnancies doesn't it?

I suppose we should prevent people who have obesity from getting help too, it's their fault they're fat after all because all they had to do was not eat!

You do not live in the real world.