I think you're a bit confused. The only hand you
don't want to be called by is
AA; you're so far
ahead of any other hand including any ace that your absolute ideal should be getting it in pre-
flop against
Ax.
The thing is, your argument here makes sense -
isolation is a very important concept and is one of the biggest reasons why we
raise. But EV is too central a concept to allow your comment
to go unchallenged.
If you get called by
Ax and an ace appears on the
flop, then bad luck, but
KK is foldable. It's
second pair with only 2
outs.
Standard move is to make a pot size bet and, if you get called (on all but the dirtiest flops), slow right down. Just because a hand is the near-
nuts pre-
flop, it's only ever
one pair.
So yes, you are correct to
raise to isolate with
KK, but you should be just as happy for A9 to
call you as 89. Which is more likely to
stack off to you on a 249
flop? Or AQ on a
Q-high
flop? With the
Ax hands where the lower card hits, the fact that they have
top kicker makes
fish feel invulnerable and you'll make that much more money out of them.