As Wikipedia defines the notion:
Tough love is an expression used when someone treats another person harshly or sternly with the intent to help them in the long run
But, here’s the thing:
In most uses, there must be some actual love or feeling of affection behind the harsh or stern treatment to be defined as tough love. For example, genuinely concerned parents refusing to support their drug–addicted child financially until he or she enters drug rehabilitation would be said to be practicing tough love.
My idiot, heroin-addict half-brother does not merit anything of that sort. I have nothing but — at absolute best — an icy and unremitting contempt for the junkie psychopath. If I were to find out that he had become homeless, and was living in a refrigerator box, my first instinct would be to track him down for the sole purpose of destroying the refrigerator box, and his few meager possessions.
The other emotional state associated with the stupid fuck is:
Schadenfreude (/ˈʃɑːdənfrɔɪdə/; German: [ˈʃaːdn̩ˌfʁɔʏ̯də] ( listen); lit. ‘harm-joy’) is pleasure derived from the misfortune of others. Borrowed from German into English and several other languages, it is a feeling of joy that comes from seeing or hearing about another person’s troubles or failures. It is an expression of pleasure or self-satisfaction at another’s failure.