Why does it appear that the worse people are either immune or resistant to hexing?

First of all i appologize for any typos, English is not my first language.
Second, the magical tradition i follow, the Macumbaria, is uncommon outside of South America, and the higher ups from the branch i follow strictly forbid us from using Hexes, I know very little of hexes in general.

Im still a novice when it comes to Magic, i used it before and i know it´s real, although i never hexed someone ( and im not sure i have the intention to ), i used magic to calm myself, i communed with the spirits, i made predictions that came true and used minor spells to improve my quality of life... but why does it appear that the worst people alive, like Corrupt CEOs, tyrants, famous abusers, the people who are bound to having thousands or sometimes millions of enemies, appear to never be affected by hexes, small or big?

Even thought i try to stray clear of hexing someone, part of me really wishes a powerful spell to take care of some of those very evil peple, i really hope wishing for it ( even without acting ) doesn´t come back to bite me, but it´s hard for me to not feel hatred when i see the monstrous things some of them are getting away with.