Do you think short hair in men is considered being under society's control, such as in military or prison?
No, it is more for their comfort.
I think so too. When it comes to hair style comfort is the priority in my opinion. They should not feel uncomfortable
Some men like long hair for beauty reasons and some like short for same reason.
I agree. Aside from beauty it can also be many other reasons such as fashion, culture, and trends
Men look good either way with both long and short hair.
Short hair
Short hair refers to any haircut with little length. It may vary from above the ears to below the chin. If a man's hair reaches the chin, it may not be considered short. For a woman, however, short varies from close-cropped to just above the shoulders. Different styles of short hair include the bob cut, the crop, and the pixie cut.
Maintenance.
Short hair is easier to care for than long hair. For this reason, many women cut their
considered a mental disorder or the hallmark of one; it is sometimes used as a synonym for lateral thinking. 
Examples.
- "The next day when I'd be going out you know, I took control, like uh, I put bleach on my hair in California."—given by Nancy C. Andreasen
- "I think someone's infiltrated my copies of the cases. We've got to case the joint. I don't believe in joints, but they do hold your body together."—given by Elyn