I was once left in a car at a young age.
I don't know when or where or for how long, possibly at the age of four, perhaps outside Tesco's, probably for fifteen minutes only. The details don't matter. The point is that I wondered if anyone would come back. It seems trivial now but in a child's mind it is possible to be alone forever.
Around the same age I began to feel a deep affinity with animals - in particular their plight at the hands of humans. I remember watching TV and seeing footage of a dog being put in a plastic bag and being kicked. What appalled me most was that the dog could not speak back. Its muteness terrified me.