Dunno if it's still helpful, but https://www.highimpactprofessionals.org/talent-directory is a directory of EAs looking for work and contained several each of lawyers and accountants on a quick search.
I think speculating about what exactly constitutes the most good is perfectly on-topic. While 'murdering meat-eaters' is perhaps an overly direct phrasing (and of course under most ethical frameworks murder raises additional issues as compared to mere inaction or deprioritization), the question of whether the negative utility produced by one marginal person's worth of factory farming outweighs the positive utility that person experiences—colloquially referred to as the meat-eater problem—is one that has been discussed here a number of times, and that I feel is quite relevant to the question of which interventions should be prioritized.
(Also also, it isn't only the poster who has to worry about the truth of what they say? It's everyone? Comments also receive criticism all the time. I don't think this poster/commenter divide cuts reality at the joints.)