The person implied that not having law enforcement wouldn't lead to the collapse of society.
Let's work out how we get there:
Your quibble is that police aren't the only form of law enforcement. The only other option given was military enforcement of the law, which both of us have now said is worse than our current system of law enforcement. So given that they said police, and the only other option is worse, which is presumably not what that commenter was going for (a worse solution than the status quo), we're left with what I said they implied: That having edit: no law enforcement (and here's the implication, neither police nor the worse option), wouldn't lead to the collapse of society.