Personally I have met stallions that are crazy, and stallions that are good. Two good ones stick out in my mind. One is a Thoroughbred stallion named River, who is boarded at a barn I used to ride at. He's kept in a normal stall with another stall right next to it, stalls on the incline above him, and down below him, he gets taken out and ridden bareback all over the ranch, and has never had any problems. He gets a little hyper, but he's a tb that was a high end jumper, so its to be expected. Everytime I went by his stall, I'd stop to say hello. My baby could walk right up to him, and they'd sniff noses, and be all happy to see each other. The other was a Dutch Warmblood called Inferno that I was looking at to breed my mare to. Big 17+ hand stallion, and the only one of the 6 they had there that I looked at that day that they took out without a chain. He walked and trotted like a perfect gentleman, let me look at his legs, his confo ect., and never had an issue. He did shows, and was always the perfect gentleman around the mares. At the barn they had a system learned from day one. When going to a show, or to be ridden, a leather halter was used, and they left the stall and turned in one direction. When it was breeding time, a nylon halter with a bell on it was used, and they turned in the other direction when leaving the stall. I think that just like a mare or gelding, any horse has the potential to be dangerous, but it all comes down to training, and natural temperment. The stallions I've met that are mean are handled roughly because the owners thought that that was the only way to handle a stallion, so consequently, just like a mare or a gelding handled roughly, after a few years, he started getting aggressive back because he was tired of getting whipped ect. I have a healthy respect for all horses, but I have no problems handling a stallion just like I would any other horse. I expect them to behave well, and I correct them just like I would a mare or gelding when they do something wrong.