I've been on testosterone replacement therapy for ten years and I know of lots of people who do too. Never, ever, run across anyone who has problems emotionally or otherwise. In actual fact, therapy, increases positive mood in guys deficient of the hormone.
Maybe if a person has a disposition toward violence and a natural bad temper, then it is possible that steroid "abuse" might fuel the disposition, as alcohol would do likewise.
The only point I think could have any validity, and again this is totally individualistic and not a generalisation of what all users could expect: sperm count over time can decline to a point whereby fertility is problematic. I for one, have two kids, and only had to look at my wife to get her pregnant! However, for the last ten years I've not fathered a child and I don't where a johnny. My wife isn't on any form of contraceptive either, yet I fill her up most nights. Still, I don't believe the claim that his sperm count is zero. His count might be very low and his boys might be lazy and swimming in all directions, but I doubt very much, the guy has a zero swimmer count.
I quote the wordsof a gentleman called Flava Flave (Public Enemy Number 1) "Don't Believe the Hype!"