Well Bee, I don't have these kinds of issues, in the last few decades I have only had one kinda mean Cock bird, I never handle any of my chicks except to examine them, from all I have read on BYC these last few years, I am convinced the loving on them as chicks messes with their minds once the hormones kick in, btw the one cock bird i mentioned got his rear end kicked across the yard and never came close to me again, I ate him, I don't like scared chickens either.
I don't have those issues either. In 40 yrs of keeping roosters, only one bird has made aggressive contact with my legs and he was not raised here. I got him in a mixed pen of roosters for eating and he was too small to bother, so turned him loose to let him get some size on him. One day I was rounding the corner of the coop and he ran up from behind and bit my leg! I grabbed a nearby walking stick and waited for him to meander around the other side of the coop and whapped him one. A little too hard, maybe...he went down, started flopping and his eyes rolled back in his head. Then he stopped moving. I figured I'd killed him, so gave him a hardy toss out into the brush and forgot about it. Felt a little bad for the use of excessive force, but he started it, so I wasn't going to beat myself up over it.
Later on that evening that bird came walking~a little crooked, I might add~up the yard. Never had another problem with him and later on he was big enough to butcher.
Another bird not raised by me and only just arrived, flogged my egg basket once. I laid in wait for him to enter the coop and surprised him in a similar manner...by the time I was done with him he was trying to make a door in the coop that didn't exist, but finally found the exit. He never repeated his bid for whatever he was trying to accomplish either.
Males I raise here never get to that point, never attempt a coup of any kind on the food bringer. I don't handle them unless I have to, I don't let them get comfortable in my personal space...reach down and give them a little friendly goose to the tail if they walk too close by or just whenever I feel like it. They all seem pretty comfortable and calm in my presence, will settle down next to me while I'm doing a particular chore, don't fight or struggle much when being handled for any reason.
Judging from those I've raised personally(different breeds) and then those few attempts by visiting roosters that were quickly corrected with a one time lesson in who's who in the barnyard, I'd say male aggression might have a lot to do with body language and intent of the human, as much as it is about genetics or breed. I've even been at a memorial service done on a farm place where a rooster was crowing through all the eulogies....I got a little tired of it, so quietly slipped over to the edge of the lawn where he was shouting and persuaded him to shut up and go elsewhere, without lifting a hand or saying a word. He didn't crow the rest of the day.
I've also seen this happen on my sister's farm, where she had to carry a buggy whip with her to go feed the flocks, as she had several roosters that would sneak up behind her and flog her and also a few tom turkeys that would do the same. When I visited, I could walk through their flock, squat down, do whatever I wished without any aggressive overtures from these same birds. Just faced down a couple when they approached and then backed them up and sent them away. Didn't have to do that again, so they must have remembered me from the first time.
When it comes down to it, chickens are....well...
.chicken. It doesn't take much to change their minds about attacking a human.