We expect one serious injury per evac and one fatality per two evacs. That means there's a 50% chance that when you initiate an evac you'll cause a fatality. Yes, in a Manchester scenario throw them out the side asap. However if the fire indications cease after the fire eng checklist then it's definitely worth thinking twice.
http://onlinepubs.trb.org/onlinepubs...rp_rpt_002.pdf
This report doesn't agree with those statistics. It says that if evacuation slides are
used there is a 50% chance of an injury. Study group of 142 slide evacuations in the Annex has
zero fatailites, so if your figures indicate there is a 50% chance of a fatality for each evacuation, I would be suspicious of your data, or very worried about your airline of choice.