I know too many people whose dogs and cats died from getting run over.

Also, I was bit in the face by an off leash dog as a child, went to the hospital, they had to stitch my lips back together.

A "well trained dog" is very subjective and requires a well disciplined person, and a "well trained dog" can still get confused, scared, or angry.

It's like saying seatbelts are absurd because a good driver doesn't crash.