I can see not being particularly sympathetic to somebody who has brought something on themselves, but that doesn't mean I won't help them... yay for basic human decency.
By the same token, if I have to choose between helping someone who luck has simply kicked in the balls and someone who knows better and did it anyway, I'll pick the poor unlucky bastard. If you have one kidney to transplant and have to decide between the type 2 diabetic who eats at McDonalds 4 times a day, never exercises and doesn't even try to manage their disease or the diabetic that tries to live properly who are you going to choose? If you have limited resources, you are going to have to decide who gets them and it is perfectly reasonable to pick the one who is most likely to make the most of the opportunity.
Of course, there are a lot of the people out there who think any resources spent on aiding others is too much. Fuck them.