I would have done the same thing to save one of my grandbabies.
You would trade 12+ coworkers for one grandchild?
How about 100 coworkers? How about 100 toddlers in a day-care center?
A moral question at the core. Save your child and yourself and allow others to be killed in your place or sacrifice you child and yourself to save other innocents, probably for a short period of time. And you have no garuntee the killers won’t kill you if you help them however it is likely they would not to maintain credibility. An evil position to be put in.