Brooks should not be fined.

I agree, shouldn't be a fine.
He was penalized in the game and according to the rules that was correct.

The hit was high and the defensive players just can't do that, no matter how tall the QB is. Their gameplan for sacking the QB, if given the chance, should take into account what the QB size is to avoid this type of penalty.

Hell, really the defense should really take into account who the QB is also, who will get the flag quicker a hit on Peyton Manning or a hit on Blaine Gabbert?

Disagree with a couple of your statements here.
First off in today's game and the mode of player safety, blows like this to the head or neck area that could have been prevented will and should be fined. Brooks could have hit Brees lower, he wasn't blocked at all and could have nailed Drew in the midsection but chose to swing his arm high.
Second, it shouldn't matter who the QB is they should all benefit from the same calls.

Appreciate that, but that kinda was my point concerning the Brooks hit, the defense should make a conscious effort to swing mid chest which means they would have to take into account the size of the QB.
I agree it shouldn't matter who the QB is, the rules should be universal, but IMO the reality is QB's like Manning or Brady get the calls quicker (and a lot of the times they are always questionable).
As far as being fined, was the swing from Brooks a blatant attempt to injure Brees? The hit was brutal and I never want to see Brees get hit like that, just not sure it was meliscious.

Why is anyone "swinging"?

Wrap or grab... No need to go club arming people. Had brooks let his arm hit Drews chest at the speed he was running then wrap or hang on he would have still gone down and there would have been no penalty.

We are not zombies... no need to start beating people with arms.