I spent 3 and a half months at a wildlife sanctuary last year, including working with a mob of 100+ Eastern Grey Kangaroos.
If these Kangaroos are so dangerous, why was I never harmed while I stumbled down the hill, 16 years old and completely by myself, struggling to carry a 20kg bag of food, and being swarmed by at least 30-50 roos? I stepped on tails and toes, pushed dominant males out of the way, and pushed hungry mouths away from the bag, without even feeling slightly threatened? Because they aren't dangerous without reason, and I had no reason to fear them. The alpha male was huge, muscular and very powerful, yet was always up for a pat... Sounds very savage to me.
Eastern Greys are very peaceful, and gentle animals. Unless they are provoked, or see reason to attack/defend, they are rarely aggressive. They're flight, not fight, animals. And I will always feel very safe and comfortable around them.