Why people do the things they do?

When we are trying our best but people don't see it, and instead decide to take offence... There is actually nothing to say. I just hope that they would stop taking offence and help me instead.

Some people just be emotional about things, but don't really want to understand the situation. Isn't it easier to look for ways to help, instead of deciding, selfishly, to take themselves out of the equation and wallow in the rhetoric of their own belief and assumptions? 

If you are sad about the situation of someone, why do you refuse to understand and instead be angry that they are struggling? Why not help them instead? 

I really don't understand. 

What a person is facing, please trust them enough to be with them, understand and respect their decisions. If you cannot do that, at least don't make it worse by leaving them. Don't turn a blind eye, force them to do things they don't want to, but then just want to be with them when things are fine, just because you believe it should be fine.

Until now, I still don't understand why this happens.