I used to debate leftists often. I spent hours daily for a number of years, logging many thousands of hours in all. I enjoyed the process of pounding them on the head because they were stupid. I enjoyed shutting them down, which I nearly always did. You can only defend the indefensible so long.
But as I grow, I see that I, too, was using this process to express anger, hurt, and cruelty. My ideas were sound, but my approach was not. The simple truth is that you cannot convince anyone of anything, in almost all cases, in an antagonizing manner.
The process was useful in helping me clarify my own ideas, but I am not that angry any more.