WOW! I am appalled! I haven't had hamsters for many years, however when I was growing up, I had many hamsters. From this guy's description, this poor hamster is just being a hamster!!
He doesn't sound like a psycho at all! I had hamsters who escaped from their cages. I know that it is quite normal for hamsters to gnaw at their water bottles and/or bars on their cages. This is a natural instinct. They need to constantly gnaw in order to keep their teeth filed down. They are rodents!! They are also nocturnal animals, so of course, they are active at night.
It saddens me that people get pets without making an effort to understand the animal and know that they have to accept this animal's natural behavior.
It seems to me that this person wanted to get a pet and expected this animal to be what he wanted it to be, with no regard for, or understanding of the animal's natural instincts. This is so sad. This person should really take the hamster back to the pet shop and let the poor baby have a chance to go to a home where people understand him.