1. They haven't yet grown up. They approach every problem by lying on the floor, kicking and screaming.
2. They are cowards, they haven't the courage to admit who they are.
3. They are stupid, they think that they are stating their own opinion but in reality, because they are anonymous, they are no one. They haven't the intelligence to realise that, because they are anonymous, their postings are the opinions of NO ONE.

Personally I don't understand or relate to them in any way. When 'I' say something, however stupid or arrogant it maybe, I want people to know that it is ME, BERT, who is saying it.