You can't blame the tool for a player's behaviour. That's on the same level as blaming a bicycle while cyclists are ignoring traffic rules.
I haven't bothered reading through 38 pages worth of yes-no-yes-no arguments, so I'll drop my 2 cents here: Stop looking at a possible witch hunt that may or may not be initiated by a selective group of people - Hooligans among football fans or literal medieval witch hunting. A parser tool could be useful for those who want to improve their damage output and get out of the so called "scrub zone". If such tools did not exist, no one would have created these "optimal DPS rotation guides" that's all over the place. Prime example being the dragoon topic here. Sure, you can create a rotation based on just theory, but this would create questions as why the rotation in question is "the best" and people start pulling out their spreadsheet programs based on average numbers they put out they see on screen. You could say they're manually "parsing". Such tools would just make it easier and help those improve for those who want to improve. Not only that, if said tools are presented on a silver platter, it may even motivate players to improve more. It takes far less effort and time than using spreadsheets, after all. For those who do not want to improve should not be surprised if they can't beat current- or last patch content till gear makes it completely obsolete. Nor should they be surprised if they get kicked out from parties for being the main cause for failing DPS checks for certain encounters. Which can be argued with what the OP started with what can be roughly translated into "I play like how I want to play". Such comments are double edged. If you choose how you want to play, then the same applies to others and who they decide to play with.