I'll agree with you on that one, but that's not to say that everyone who jumps in on one of those "attack campaigns" doesn't have a valid point, because I've seen instances of that.
In some cases new gamblers open accusation without valid point or evidences and most of the time it happens because they don't feel it necessary to read terms & conditions before using a gambling website. After facing issues with withdrawal they think that website authorities are not providing fair service. In a situation like this they follow the way of creating accusation by their own and don't care actually its valid or not.
What everyone has to remember is that there are a lot of trolls on this forum and a lot of alt accounts. You never really know why someone is saying what they're saying or even who they really are sometimes.
Ignoring is the best option when they are looking for your response on their thread. If any specific group have their own agenda to spoil any platforms fame then no one can't stop them from doing this rather then ignoring. Accusation with valid point is always a priority and forum community is giving enough response on this field.