I've kept a distance from this thread for a while considering I already have a long history of posts in other threads like this one each time they come up. However I'd like to counter the point you've provided real quick as it seems to always come up in these threads.
I implore you to watch this video: WoW: Accessibility and Apathy
Like really, really watch it it's been posted in nearly every one of these threads by multiple posters, multiple times.
While it isn't primarily about the use of a parser it does touch on the issue quite well and shows what the likely scenario would be which is overall apathy from the general playerbase, granted this was done in World of Warcraft which allows the use of add-ons and by extension parsing programs. The results however are not to be ignored as WoW also boasts the largest sample size of players and experiences one could ever hope for on any subject concerning MMO players as it is still the most subscribed MMO in the history of the genre.
Yes there will be cases of harassment occasionally (something that happens already regardless of parser usage), however over the greater size of the player-base it isn't likely to be an issue and even in the cases that it does happen GM support is there for exactly this reason, to resolve of issues of player harassment as they do currently.