Parsers do not cause toxicity. Players doing the same static content over and over again builds toxicity. There is a point where players don't really want to be doing the content, but are there anyway because of the weekly grind or social agreements. Plus damage dealing isn't something intuitive enough for an untrained human being to pick up like tanking or healing. The signs that someone is doing it right are hidden in a mountain of numbers. The parser is just performing the courtesy of adding those up for you. Depending on perspective, the problem is either people not looking at the numbers in the context of the situation at hand or the very existence of damage dealer as a role.
