option 2, but work really really REALLY hard on figuring out a way out of this mess....wait. Can we pick which 10%?
Did it just get cold in here?
Yeah you know immediately that that would happen.
The result would be a society, where, at best, there was a lottery for those who would be killed. But in reality they'd just start labeling people into various classes with the bottom 10% of classes always pushed out for the slaughter. Whether this was done formally, or they just kinda let the slower people fall behind... the result is the same.
Option 1.
We live together or we die together. Those motherf**kers over there will not destroy our society from within.