I can't dissagree with that.
Saying that i do thing the older generation or parental one do have an influence in what happens, not saying they can change the course though.

~Parental influence for dummies~
50's - 80's "You will do this you will do that etc"
90's onwards "go ahead kid, have fun".

We... well some of us rebel against our parents wishes to the day we die, obviously some people are extreemly lucky in the relationship they had/have with their parents. So many people will teach their kids about life and disipline them based on what happened to them, Their parents were hard liner, so they decide "I will never hit my Kids" result... Spoilt brats that feel no need to rebel against any society because they can do what they want anyway.

I think it is older people who tend to march for a cause more simply because they have grown up a bit. They have gone past their hard done by or spoilt childhood, out on their own, able for the first time to a form a fully independant (obviously media influences are there) opinion about the world they have seen, and can react as an adult however they feel.