Why Should I Raise?

[sthief09]

here are 3 situations where conventional wisdom says I should be raising. However, in each situation I see good reason to just call. please explain to me why I should raise.

1. You have AKs UTG+1. the table is very good and there are a few LAG's behind you. as is typical, they will call a lot of hands for 2 bets but a lot less for 3. UTG, a TAG, raises. why should you 3-bet?

2. you have AJs UTG. there are a bunch of loose players behind you, but again, as I think is typical, they will limp or overlimp with all kinds of trash, but they have some standards when it comes to cold calling. the blinds are typical. why should I raise (as opposed to limp reraising)

3. you have AA on the button. the blinds are both big LAGs who overplay their hands postflop and rarely fold for just one more bet from the blinds, but will be a bit selective for 2 more. a TAG opens from MP. why should you 3-bet?