I don't know how, but I fear that I could.
***
Well, the fact that you "fear" that you could would probably keep you from doing it.
I would hope so, but the thing about these type of tragedies, is it has an element of "every parents worst fear" and "There, but for the grace of God go I".
Being "absent minded" and "forgetful" by nature, I can understand all to easily how these things can happen. That is why Airbags, and rear safety seats bother me, because as an "absent minded" sort of person I have to always have visual cues, to keep me from forgetting what I am doing. I'm the sort who never leaves home without a post-it note on the dash to remind me where I am going, and what I am doing.