Has absolutely nothing to do with being pussies. If your dog darts out in front of me and I hit it, don't harass me about taking me to Judge Judy. It's pretty simple, if something happens to your un-leashed dog get ready for the consequences. Being a dog owner myself, I would never leave my dog off leash where there are cyclist. I may trust my dog, but I don't trust that other person. So I won't take a chance of an accident. Until then I really don't give a F what you do and I'm going to keep on riding. I respect everyone and everything that I pass on the trail, but I can't control what an animal will do. If an accident occurs...it's only you to blame (dog owner).
And this can even apply to little kids or even adults. People think their the only ones out on the trail and don't look/hear whats around them. If you can't control yourself, your kids, or your dog(s) then that's not my problem.