Indeed. A more direct, active way with the goal of not impacting those who abide by the rules.

Without saying which way is better, your claiming that fines are more 'direct' than putting physical barriers in the way is blatantly not true, barriers being the ultimate direct prevention.

I'm talking about direct retribution over prevention i.e. people visiting the sites without touching anything aren't directly impacted by those who do touch, however they're directly impacted by putting up glossy glass over those same sites.

Those visiting the sites who do touch that which they're told not to face direct retribution and serve as a warning to others not to do the same.