Oh god Kel... I have seen that video too... it doesn't make it any easier with the "Somewhere Over the Rainbow" song playing all through it too huh?
It is just so terrible that these little angels have endured so much and then teach us a very sad lesson... bless their little souls
I try to not let those things get to me... I am a way OTT paranoid and protective parent to Harrison, moreso than I was with James and Madeleine... so watching those videos can set me off on a wrap-him-in-cottonwool state of mind... I think awareness is the key thing with those, just be aware of what is going on in your child's life. You ARE a bl00dy fantastic Mummy to Jemima and I am sure you would never ever see her put into a difficult or dangerous situation, and as you said you get a "feel" for these things too.
Huge hugs I hope you're feeling better after your cry.