Tedium
Not that I'm in favor of insecure CCTV cameras, but have you folks ever spent any time actually looking at the output of a security camera? Typically it makes watching grass grow look exciting.
I submit that for the vast majority of CCTV cameras, security simply isn't a reasonable concern. No one cares and no one should care.
For too many of the fraction where securing is desirable, the toolkit for securing them is going to be utterly incomprehensible to the folks doing the installation. That seems to me at least as big a problem as shipping an insecure product.