FUD is here for one reason - Money.
Those guys FUDing are not warning anyone.

How do FUDers earn cash:
1)
They are trying to earn cash "blackmailing" company.
Most scam companies that exists thanks to hype, will usually pay FUDers so they will remove their slander statements.
FUDers learn - that writing FUD can give them cash - so they keep on slandering companies expecting cash (bribes).
2)
If person is "trading" tokens he might try to inflance market after selling tokens.
After selling token at new all time high, he will try to spread as much FUD as possible, to make tokens drop so he can buy them back at lower prices.