Pain medicines can be used in the wrong manner but it is harmful and a sane person wouldn't do it, also, the advantages of these medications out weigh their disadvantages, unlike reps, they are absolutely unnecessary because you can READ what a person is saying to tell whether he is trolling or whether you should ignore him or not, you can't judge people depending on such system which can be easily miss-used. Also you said reps distinguish between trolls and legit users, what if a new user gets negged, like in my case, I'm new here so when that person made multiple accounts to neg me, people would think I'm a troll by looking at the red rank which says "this person should be ignored". Removing the system completely might not be the best idea but the system isn't perfect either!
I MENTIONED THAT TOO.