McGrath - Okay! We are both allowed our opinions but you seemed to be insinuating I have done the same with my children.

Let me clarify.

YOU seem to think it reasonable / normal to leave young children alone!

I do not! Why?

Possible / likely scenario.

One 4yr old child
Two 2yr old twins

Parent checks all asleep! OK.
Leaves room.
On shutting door, makes slight noise.
This noise disturbs 1 twin who gets restless.
Restlessness leads to waking.
2yr old wakes up, cries / calls for parent
Cries wake other twin & older child.
Discovering they are alone & ignored they panic.
Within minutes of the parent leaving you now have a scared / panicking 4yr old in charge of scared / panicking 2yr old twins.

And YOU think this is OK?

I do not wish to continue this particular train of debate as I will never agree that it is reasonable or standard practice.
You may act as your conscience dictates!