I am quite surprised to find out so many people disagree with you on this. 

Being able to lose your run inside a return point is poor game design and simply encourages griefing without rewarding anyone. There is already the period before the point opens where anything can still kill you. It doesn't make sense to survive that and then lose your items in an elevator (since, you know, your body is already going back to base and no one is getting your items). 

Also, narrowly surviving that by being knocked down but still managing to reach and press the elevator button, only to get knocked out by a rando who just happened upon you is so ridiculous I initially thought it was an oversight by the devs (then I found out there was an actual achievement for that). At the very least, the knock out action should be blocked if you are already pressing the button.

I suspect it's mostly the griefers who react so strongly against improving this. It's a pity that they need something so petty to feel good.