To be fair, there are many sections of FISA that are not so "lawful"

http://en.wikipedia.org/wiki/Foreign_Intelligence_Surveillan...

AT&T's domestic wiretaps were (are?) "lawful", but still a threat to civil society. So why isn't Google open about the volume of data they relay to the state?

lawful? you mean like this: http://www.eff.org/cases/hepting