aries, I think you misunderstood the posters who are arguing with you. The point is that there are no 2 sides to your question. EVERYONE agrees (or if someone doesn’t, please post!) that it is forbidden to do other things while being paid to work. So what is your question, meaning what is the argument the other way? The reason the “man walking behind a women” had so much discussion is because there were many people arguing that perhaps social expectations would be a more important factor then the Halacha, and there was some debate as to what the exact parameters of the Halach was. Here this is no question. If you read through this post you will see no one says it’s ok to post without permission while at work — no one even mentions any mitigating factors (except for adorable, with a side question) (And if you read the thread you can see that many of the posters who often post vehement and extreme defenses of other Halachos, have also posted unequivocally here that it is gezeila.)
As far as if you are having trouble being dan lkaf zchus the posters here, I can give you many possible explanations:
1)People are posting from all different time zones — what is during working hours for you may be different for them.
2)People may work unusual hours even in your time zone.
3)Some people work jobs with down time during which their boss allows them to do whatever they want, as long as they are there and available in case the phone rings or someone comes into the office, etc (and we can assume they have permission — I know a few people like that).
4)Many people work by the hour or the job, rather than during the set hours of 9 — 5.
5)People may have lunch breaks/ coffee breaks worked into their schedule, and post then.
6)Some people are their own boss!!!
The point is that there are many legitimate ways to be posting during the day, and there is no reason not to assume that your fellow posters are following Halacha. If someone is in fact stealing from their boss, and by reading your question they stop, then it was worth you posting it. But as far as in your mind, I really don’t see what the difficulty is in understand how people can manage it.