Jacqui, They're not MY peacocks so I can't answer all your questions about them.
I can tell you however that the quad-bike riders have in the past chased and killed, or caused the death of, a number of livestock including peacocks, chickens, goats and lambs in the Kaya Valley. They've also been seen deliberately squashing tortoises, chameleons and agamas. The peacocks are caged for part of the day for about 8 weeks during the summer because of the quads, and at night during the rest of the year to protect them from polecats.
Whether or not you care to "buy that argument" is entirely your choice.