Illegal, but historically, it was rarely prosecuted until very recently (e.g. Enron). The fact that the nation is now clamoring for scapegoats in Wall Street.... means that the voices are getting louder demanding strong regulation (PREVENTATIVE) so that this manipulation crap is avoided in the first place. Eventually, when the extreme regulation mindset grows louder.... free market capitalism will suffer. Suffice to say, THAT will be bad for everyone, everyone.... except for maybe fans of Marxism and Socialism (who will claim victory).
Rarely prosecuted because it's hard to prove, not because prosecutors aren't looking for a case. I can't really make heads or tails of what you are saying because other than making it an illegal act there isn't much in the way to regulate some dope publishing rumors on the Internet or elsewhere -- that pesky 1st Amendment gets in the way you know.
As for Wall Street "scapegoats," no I don't think people are looking for those. They are looking for the real crooks. Unfortunately, they are not going after the ones that were at FNMA or FRE or in Congress as well.