Children deserve a safe park. (And yes we know Fluffy is a nice dog but any dog can bite)
People who are scared of dogs deserve to feel safe.
On leash dogs deserve to live their lives without being accosted by off leash dogs, which increases fear, frustration and anxiety.
I want my dogs to be confident and happy.
There are no safety guarantees in life, just as there are no guarantees in behaviour. But when the odds of an incident are so high, I can't ethically take the risk.
So we'll find other parks, other trails.
But it's a shame that good, responsible dog owners have to choose to leave because irresponsible, self centered dog owners won't.