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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?

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No play in poker is automatic, the right situation can change any book strategy.
1. In my opinion this is a great situation to just call with AKs. In this situation calling will make more money than 3 betting in the long run in my opinion. I would rather play AKs six handed than one on one, but maybe thats just me.
2. With AJs utg i usually limp in a tight game to encourage multiway pots and raise in a loose game. Your description still sounds like a good situation to raise AJs since youll probably get atleast 3 callers. However if you felt that raising AJs would likely win you the blinds or get you heads up, but just calling would put you in a 6 handed situation, then limping looks fine.
3. If you think that both the lags will come in if you just call, then I love calling here also. Sure if you just call here you will not win as often as if you 3 bet, but your goal is not to win, your goal is to make money, letting in 2 bad players will make you more money in the long run than 3 betting them out of the pot in my opinion.