I mean what if I click on a /b/ link "at work"? Does that make my work output immediately tainted and the company has to immediately file for bankruptcy?
It’s a little like the Van Halen M&M test: if you don’t follow that rule, people have to wonder what other expectations you won’t meet.
No, much easier just to fire you. You’ve shown a disregard for what is almost certainly company policy, and created legal risks for the company (e.g. if anyone walked in on you while your screen was showing naked people).