My experience is closest to
@Yardmom 's and
@Maddcatter 's. All roos here have been raised within the flock, and if you let broodies raise chicks they're inevitable. In the early years when I was inexperienced, I had what I then considered to be difficult/aggressive roos, and culled 2 at different times 'for the good of the flock' (which was the advice I was following at the time).
As I have gained experience, and successive generations have been raised by the roos that weren't culled, my perception has changed.
@Shadrach 's article is essential reading, several times ideally. How you and your family behave around your chickens is important. If you are friendly, relaxed and comfortable, the chickens will be too; if you are worried by the scare stories, feel threatened and are nervous, the stress levels rise, and the chickens will be on alert too, because they will then be threatened by your posture and movements. I have a grandchild who would love to get to know them better, but every time she runs into the garden arms outstretched, they scatter

When she has learned to calm down and not appear to chase them, they may hang around long enough for her wish to be fulfilled.
The space and environment in which this takes place is of course critical. Mine live free dawn till dusk; the males chase each other around periodically and knock each other off squatting hens, but there's room to run and endless places to hide, and the only real fights have been years apart, when the old dominant rooster has been superseded by one who was, until the day before, his wing man. They spend far more time working together to watch over the flock than they do reminding each other of their respective status. When I approach, some run towards me (hoping for treats) and some run away. I do feed treats direct (not via a roo) but I put them on the ground and stand back, and if a nearby roo wants to pretend he found them, he can. The hens aren't fooled
I haven't yet had to cull males because there are too many of them. As chicks they seem more prone to death by misadventure, and there seem to be some diseases that are more serious for males (or possibly the genetics in a male line in my flock are faulty).