I can't afford a private security force, but I could afford an on-demand subscription.
You want to defund the tax-paid police? Go right ahead! Now I want to collectively fund my own security force, for crimes that the police is understaffed for, what _exactly_ is the problem?
If your concerns about police abuse or neighbors calling security on minorities, then focus on fixing that (defund them?) and let me interact with the private market. Or is this controversial from a rich-get-security perspective?