Helping other people out

[Bonnox]

Just posted something in the first aid section but thought I would pose something similar here for opinions,
It's regarding a mass casualty event, if you came across strangers who say had had a bus crash and a dozen or so people were injured, would you stop and help ?
My points/thoughts are
1: using your first aid kit is just that its using your supplies, things you may need but once their gone you may not be able to restock for a long time
2: could you leave someone to die ?

And what if it was family ? How far would you go knowing it may have serious consequences to your own survival ? Eg 86 year old aunty Ethal falls and breaks her hip, now she can't walk, if your on the move it would take two people to carry a stretcher, then there would be food to keep her going for little repayment (everyone has a job post shtf in my view be it washing hunting cooking etc)
Now I'm not advocating aunty ethal gets a shovel to the head
But it is something to think about and consider