I don't really see it that way. From my perspective it isn't toxicity as the driver, but a strong sense of user preservation. Many people I know in security value the customers more than they value the company itself. They're the antithesis of political - their inability to understand higher order company-level or product-level issues often hamstrings them because their goals aren't aligned with the company goals. Though I have a limited view - I'm sure there are many companies that are operating as you've said.

The teams I really strongly respect, for example at Square/Microsoft, manage to align user interest and company interest very well - that's a very hard thing to do and requires top to bottom investment. Microsoft's approach has been to monetize security, which makes that easier.

Both organizations also have resisted the mistake that you and I both agree most orgs make - they've invested heavily into hiring engineers to solve security problems, and you generally have to pass a coding interview even for security roles.

edit: Reflecting more, I suspect that the described behavior of hyper-political teams that have a self-preserving structure is probably something prevalent, but that I haven't had the misfortune of being involved in. I would imagine companies like that are generally toxic across orgs, and not just in IT, but probably any area where investment is forced and it isn't revenue-generating.