That's not the problem. The problem is that ones opinions regarding the entity responsible for issuing their paycheck are inherently less valuable, and this context is important for others reading.

You might think you are completely objective and unbiased, as do most others, and maybe you are. But, most people are fooling themselves a little. Nobody will admit to themselves, let alone others, that they work for someone evil.

So really, if you want a place of real discussion and debate, it's important to tie people to their companies in cases where they are participating in discussions about these companies.