I've been on this site for about 18 years. I never felt I really fitted into either side of the debate, as I was a college teacher, so worked very few part time hours, could change my hours every year, so my children never needed childcare. My children are older teens now, and I still work part time hours so I can do the school pick up most days and of course I'm at home in the hols. Working my hours around the kids meant the most my children have had is 1 hour of childcare a week. So I'm fairly in the middle.
But over the years, I have seen the vitriol on both sides. SAHM accuse WOHM parents of poor parenting, saying things like "why have children if you're not going to raise them", of emotionally abusing their children by sending them to nursery, of not being there fir their children, being selfish by working and not putting their children first etc etc...
Then there have been the implicit digs, like SAHM are "full time mums" (although their husbands are never "part time dads") because even when their children are at school, they're emotionally available for them the whole time.
And the WOHM have done the same to SAHM, accusing them of being lazy, of not being a good role model to their children etc... of being financially irresponsible etc.
And they too have have the implicit digs, I couldn't be a SAHM because I'd be bored etc...
But I'd also say do recognise OP, that returning to work after being a SAHM is easier for you as a teacher than many other professions. You're likely to be older, more experienced yet still cheaper, because you're unlikely to be on USP 3 - that's the dream for heads and employers! You also have the benefits of a job that has very child friendly hours (I know teachers don't leave at 3, but a lot of work you can take home with you) and the holidays are sorted. This isn't the case for women in a lot of other careers. FWIW, I saw that my friends who were in professions, found it relatively easy to return after having children. But those who had worked their way up, who had gained qualifications through work (eg working in insurance etc), found it impossible to return and many ended up in shop work or other low paid but flexible jobs.
And finally, the finance thing is a real concern. Many think they're financially sorted... but spend a few years on the relationships board, or do some trowelling, SAHM being left high and dry or finding it difficult to leave seems almost as predictable as the "script" (affairs).
So no OP, I don't think MN is against SAHM. I think if you think that, then perhaps you have confirmation bias because you're not seeing the bun fights that have been on here as old as time, mud has been slung viciously from both sides, for the past 18 years at least!!