My understanding is that he slept (ie. lived) in his office, so having a bed there would be normal, not "creepy as hell."
Also, many professors have beds in their labs in case of long-running experiments. I've seen them and thought it was practical.
I read all of the related links about Stallman and didn't see any actual evidence.
What's odd about the US left is that they support Islam, which allows child brides as young as 9 yo (it happens every day.) Think about that for a moment before you get outraged about Stallman's personal views. So leftists, stop being creepy yourselves and get your own house in order before criticizing other people.