Doing one bad thing does not necessarily justify other bad things done to you.
That said, I don’t like this cheating-enabling software either and think the world would be a better place without it.
If the software in question was explicitly intended for illegal purposes, would you still take the same position?
For me, moral lines exist. I don’t defend the right of people to profit from immoral acts.
- the original software is clearly unethical, and I bear no goodwill toward its developer
- I support the consistent enforcement of the GPL
In a case like this, I think it's natural to state both points. If we only focus on the second, we may be contributing to a groundswell of support for the original project/developer. That's distasteful when we only want to narrowly support their right to have their licensing terms respected.