There were a number of people who had the legitimate and sanctioned need to access prohibited material (I was one of them). At the time (and even now) it is virtually impossible to open every website that someone might need to access. Personal use was allowed as long as it didn’t impact your work and was inside the guardrails. We tried using Websense back then and it was a disaster. Virtually everyone complied with policy. There were a very small number who didn’t and I was responsible for catching them.