One should be cautious about "general conceptions." I think a strong case can be made that activism today is as high as ever, perhaps more so, and is also taking new and significant forms. There has never been anything like the international solidarity movements that began to take shape in the 1980s, right in the mainstream, or the global justice movements that have become a very powerful force in later years. It's true that the society is highly atomized, which does induce a sense of hopelessness often - quite mistakenly I think.