[user104658]

Originally Posted by Niamh.

Actually I think mentally retarded people can be more prone to aggressive outbursts infact (According some people Jedward have an IQ of 50 so this would make them retarded basically )

Aggressive behavior in people with mental retardation appears to present with greater frequency than in those without intellectual limitations

http://thenadd.org/modal/bulletins/v5n4a1~.htm

Correct. The people MOST prone to violence (proven, scientifically) are men in the IQ range of 70 to 90.

This is also why men who have lived otherwise peaceful, non-violent lives can turn nasty with alcohol OR in old age. IQ levels drop by up to 20 points when drunk and can do the same with the onset of dementia... putting people of average intelligence into that 70 to 90 range.