Roger's anger and disillusionment

Through the lyrics in Dark Side of the Moon, the anger and disillusionment that Roger Waters felt towards the world and the people in it became apparent. These feelings would become stronger and more developed in later albums such as Animals and The Wall.

Were there any particular reasons Roger began to feel this way? How did Roger's father play a part in in a Roger's change in attitude (if at all)?

Please humour me. I'm just interested to read what everybody thinks. I tried searching for a similar thread, but I couldn't find one that said exactly what I wanted to say. If I have missed one, I apologise in advance.

You're a new fan, right?

Check out the "Classic Albums" DVD that discusses the making of Dark Side. You'll get quite a lot of explanation from Roger about his motivations behind the lyrics and how his world view shaped them.

You mean the Dark Side DVD?

I just bought it!

not really. It's just that this is one area of Roger's life I don't know much about.

Apparently in 1972 he realized that life was not a rehearsal for something to come after, and decided to write about that.

...And he realized that his perception of time shaped his approach to life and he decided to make a concept album based on how people's perception of time, money, religion, humanity, etc. shape their lives and who are they are and cause them to become either humane/inhumane, greedy/generous, mad, etc.

Couldn't have said it better myself! The "fundamental question... of us and them."