I don't leave DS alone generally. but I have moments when I don't look (e.g. just nipping back inside for a moment), unloading the car. dealing with DD (7 years old). I don't have 8 arms and hands and I don't have eyes in my back. the only other option would be to not leave the house anymore at all other than taking DS to school. I couldn't live like that and I couldn't do this to my children either.
but maybe this is expected of me. I don't know. maybe I really should not go out with DS anymore if I cannot 100% guarantee that I am focussed on him at all times. Sometimes its different to judge for me what is reasonable and what is not. maybe the public's right to not being exposed to inappropriate behaviours by a child with SN tops our right to access the community even if it means that an unexpected and inappropriate behaviour occurs.
I get it, and no judgement here. To survive, parent both dc's, and not be at the bec and call of others decisions, you have to find ways of preventing 'culture clash'.
What is 'expected of you' will depend on whose doing the 'expecting'.
If you stop going out generally someone will report you for isolating your child. (or cared for person)
Many issues arise because we're trying to live normal time poor lives, in non normal situations. Something always has to give.
So lets be honest here, rather than be 100% focused on caring for the other person (because childhood ends, but the issues don't) we learn to focus on others perception of our caring, and heading of trouble before it spots us and decides we're an issue for them.
That means taking them back inside with us if we have to nip in, even though we know it may be distressing for them to have that change in expectations, and may wreck their day. and the amount of additional time spent will wreck everyone's day. However once it becomes clear that doing this ends the fallout from SS investigations then it becomes common sense and debatable as to if it might not be better in the long term for the caree.
In time you'll develop strategies around this to not have to go back for anything.
When unloading the car you end up having to drag them back and forwards, or you unload to the doorstep, then unload them, then unload into house etc etc.
Imagine that your ds had much higher needs and the only predictability was anything could happen at any moment, and work out everything around that. It's exhausting and unfair but there's always a way when you have no help and no choice.
I'm not saying any of this is how life should be, just ways of working around changing social demands and surviving.