Earlier quoted context omitted.
>The idealized future in my option has something like 1/1000th of the current population Okay! You first though. What, still here?
"You participate in society, how curious" If they're choosing not to have kids then they are doing their part towards their beliefs.
The thing is, in advocating for removing 999 out of 1000 people (how? I don't hear a suggestion for a gradual decline, so assuming a bloody genocide seems like a reasonable interpretation), opens a body up to pretty harsh criticism. It's reasonable to read that line of reasoning as a direct threat!