Personally I think it's fine the way it is. Playing since 2013. I have used it myself to save either a dps thats not paying attention to a mechanic that is about to kill them. Mostly on people new to raids.

I have been trolled once with it. I told them to stop. They didn't. I left along with the other dps. Not worth the headache imo. But if you need to report them, you all got to make sure to tell them to stop using rescue for (insert whatever troll reason they used it)for in chat, not discord and the likewise in game chat. They do it again, you have the option to report them as the GM will see the logs at that point.