Often, this is the only way they'll learn. And if they don't learn, well, I don't really give a shit and will just boot your ass to the curb.
I probably give more of a shit than I say, but it doesn't matter, I believe it's my Ti that makes me a man of principle, so I MUST follow through. I don't really get any pleasure from it, especially if it's someone I care about, but if I feel like it's my responsibility to give out a karma bitch slap, I will. Without hesitation.