When talking about a mutual acquaintence with a friend I said "he probably has more fear than he needs", and then I realized that I too have more fear than I need.

To sum up my sons, if I accelerate the car rapidly, my 10 year old says "slow down dad" and the 6 year old says "do it again".

The 10 year old is a new soul and a literalist. He has reason for his fear but since breaking his arm he has not gotten back on a two wheeler. He'll need a push just to ride with peers.
His brother is an old soul and may need to be pulled back from time to time.

I just thought of a subjective ratio.
The fear trust ratio.

For myself I give it an 85-15.
Maybe 90-10
There is a projection of fear here.
The neighborhood projects far more fear than trust but there have been murderers and killer snipers as well as an adimistration of fear which have traumatized people who at one time may have been more trusting.
I don't think it is a healthy ratio but I don't know if 50-50 is a good one either.