First, There is a reason why they are called accidents. Sometimes there is nothing you can do about it. All you can do is think about how you could change things so it doesn't happen again.

Second,
I have had people walk 4 wide across a trail blocking traffic from both directions. I have seen kids run across the path in-between bikes. I don't know how there was not a crash. When there is a crash, it has to be blamed on the pedestrians being stupid.
I have also seen bicycles riding way to fast for the traffic on the path. The average walker is going 3 MHP. The average jogger is going 7 MHP. The average out of shape tourist bicyclist is going 8-12MHP. And then there is the speed bicyclist weaving in and out of the people. There will be a crash and I would blame it on the bicyclist.

So, There are times and places I don't ride because of the morons on those trails.

If you are just avoiding a few morons, good luck. The law of averages should help you, because you have already had a crash.
If you are going to fast for the other people on the trail, maybe it is time to find a place where you can ride faster without having to avoid slow people.