A person may act silly and stupid because they want attention.
They may act in a way that results in them being bullied and they do this purely for attention. They may not realise that they are doing this.
Wanting attention is dangerous because it makes a person do things which may be bad for them.
The attention they get can be for doing bad things, in the way children may be naughty to get attention.
In fact as it is easier to do bad things than good things, in the same way it us easier to destroy a car or house than build one. So wanting attention is more likely to make them do bad things for attention if they have short term aims.
Of course in the long term doing destructive things for attention will mean they get less attention because of how things go wrong.