Yes. Sometimes tough love is what's needed. Doesn't mean that you're mean, it just means that you know what has to be done.
I don't think that I can harden my heart too well... unless one of the roosters is giving a bit too much attention to Poppy or, especially, Marshmallow; then they'll find a boot up their vent and discover the sensation of true flying....
(Joking, I don't kick my roosters that hard. Just enough to shove them away. Though, there was a time when I kicked at Lefty and actually hit him... I thought that he'd move, but nope! Nailed him in the chest, and he rolled. Just, full 360, wing over wing. He was perfectly fine).