Theo, I'd say that vitriolic attacks have been mainly made by pro-dominance posters.
I can't speak for others - I try to post in a polite, supportive and courteous way. Generally, if I really struggle to say anything nice, then I think it's wiser simply not to post at all.
What I would say, is that sometimes on here people seek help for behavioural issues; possible remedies can be suggested which are potentially dangerous, and likely to be ineffective. It's natural that people whose professional experience is involved with dogs, or like me, spend a lot of time volunteering with rescues, should be concerned, and genuinely try to suggest routes that are easier and safer for posters, their dogs and their families. From a rescue POV, I see a lot of the fallout when bad training/ownership goes wrong.
A great deal of academic work has been done to understand how dogs learn, and their social interactions - it would be a pity for that to be ignored.
Thankfully, we no longer suggest that beating children is an effective method of discipline, neither do we allow it in our schools and most homes. Slowly but surely, we are realising that "training" for dogs when involving harsh physical methods such as shock collars, etc is both morally wrong and ineffective.
I realise you don't advocate such extreme methods, but unfortunately a lot of dominance based trainers do, and there are plenty of them still out there.