I'll be right back - I need to tell my local pub and parks authority that they didn't think through the basic consequences of their actions when they made a place people could meet random strangers. I'm sure they just haven't thought through what a moral failing offering public spaces are.

Edit to respond to OP's Edit: Your quote you're replying to includes "And prevent it". Which made us assume you were directly implying that prevention of bad consequences was your point. Yes, people should clearly think through consequences. OP wasn't implying otherwise and specifically structured their statement to include "the worst possible thing" and "prevent it".