LOL You’re a devious one... “:^)
Seriously, it’s a beautiful principle. It encourages people to be in the habit of blessing and loving, and letting God balance it out. We never know what we can’t see - what the full context is that causes a person’s attitudes, beliefs, and behaviors.
That’s not to say we should be pushovers and allow evil to do evil, or to be willing victims. There’s proper justice, and there’s the gratuitous stuff. It may be that wishing an enemy well serves to turn him to good.
People often wonder why bad characters can hang on forever. Castro, Arafat, the Clintons.. Maybe part of the problem is that the bad people are always being cursed, which may then merit them a few extra days on the planet to make up for it. A thousand curses outside of righteous judgment could then turn into years...
If they are evil, then their own deeds will do them in one way or the other, as they will reap what they sow. Curse these sorry souls and oh my, no no no!
So not devious at all, just a matter of being aware of the risks. :)
Besides, it makes life easier to put up with in general.