While everybody can understand the anger, the bad behaviors of some individuals must not be generalized to a profession, can it? Maybe "Demo Day attendees" would be more appropriate than investors.
"A reminder to Clergy people: no sexual abuse on children are permitted."
I think if I was a member of that profession, I would feel insulted.
EDIT: rerephrased according to comment (that may invalidate the commentors' opinions).
There are a lot of common sense things in this world. Washing behind your ears, changing your sheets... etc.
I'd compare it to police corruption: the problem isn't so much the few corrupt cops, but the fact that the rest of the police will cover for them.