Those statements are true, but I would add that people are free to leave feedback as they see fit in either case.  Often you will have no idea whether a manager knew about the project being a scam or not.  Look at the case of atriz, who got negative trust only after he admitted to knowing the project whose campaign he was managing was a scam.

I agree, there is too much BS going on with scam projects and the bounties that advertise for them.  I would recommend painting scammers' trust pages liberally with the red paint when you find out about the scam.  They deserve it, for one, and it can also warn others not to deal with them.