You can find a ton of urbanites/suburbanites who want surveillance to ticket speeders, reckless driving, loud exhausts, etc. And they're out buying Ring cameras and alarm systems because they're worried about house/car break-ins and theft.
And if you take a radical online urbanite leftist and start talking about right-wingers sending rape and death threats to women/minorities, and the kind of online communities that breed those kinds of people, you will likely find sudden enthusiasm for surveillance.
I think the problem is primarily what you wrote about "outgroups", where once it is the "other" that is targeted, then people support it. They just don't do the math about how that is happening, what institutions are doing it, or how those policies and methods could eventually be turned against them.
And yeah, there's Fundamental Attribution Error at work. Still, I think there's some more narcissism-spectrum-related logic at work where people don't have the self-reflection to consider that conditions they impose on others could wind up getting imposed on them.