h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

What is guilt?

First of all: is there any such thing? Sure is, people have to be guilty of something, they wouldn't feel like they do, would they not. Alright, but is that a proof? is anything a proof? We'll take what we get, so:
Guilt is a social thing, made up by humans for humans and would cease to exist, were there no society.
Guilt is something for all of us, we all feel guilty of certain things and some of us will try to blame others. Blaming is actually the way one produces guilt, isn't it? Thinking hard though, one will always find a way to blame others, won't one?
What's wrong with guilt then, if it's so easy to blame others (You can try to, you'll always find a good reason, why somebody else is responsible.), if it's not even measurable, does it exist?
Guilt is "blame or responsibility for wrongdoing", I just looked it up. So there are always others to blame or to make responsible, it must be the wrongdoing then.