> Stealing is usually a function of reward/effort.
Except that for digital media it's a Smart Cow Problem[1], the effort is only there for the first person who wants to circumvent it, then it becomes trivial for everyone.
However, I'd suggest that the reason some on HN react strongly to these suggestions is that they rely upon security through obscurity, which can be dangerous by providing a false sense of security when none exists. While this probably isn't as big a deal when it comes to your HTML and CSS, security is a case of err'ing on the side of caution.