Not bad Massimo. I'll try this...

You hold Ks Jd You raise 4x get 1 caller

Flop comes Kc Tc 5d You bet 2/3 pot Villan raises 3x
If you call Villain will probably tap you...

If we know he has K9, JTo, 87o... We know this is an easy call/push we are way ahead.

But what if he has AK, KQ, KT, TT, 55. We are way behind. We know this is an easy fold.

But what if he has Qc Jc, 5c 6c, Ac 2c these are almost coinflips. Most players would raise these hands. What do we do here?

Statistically we are huge favorites, this situation is very +EV
Board: Kc Tc 5d
equity (%) win (%) tie (%)
Hand 1: 83.1140 % 82.49% 00.62% { KsJd }
Hand 2: 16.8860 % 16.26% 00.62% { random }

Now do you really want to call his raise knowing that he could push turn?
If we decide to reevaluate turn, any club(9), any A(3), any 9(3), either 5(2), either T(2) are all bad plus maybe any 7(3), any 6(3), any 4(3) for those with 75, 65, 54. This is 27 possible cards out of 47 that could give us trouble and invoke a push.
Are we better off waiting for a better hand?