to raise or not to raise

[conslice]

personaly i liek to re raise AK preflop. but i was wondering. what situations should AA KK QQ AK not be re raise with preflop. either to set a trap. or to avoid walking into one yourself. ie holding AA in MP and somone puts in an average raise from early position do u re raise that and shut everyone out possibly even the original raiser?. anyone with any tips on situations to do or not do this please respond. give an explanation to