To beleaguer your "cleaning the pools" analogy: It is not as simple as just cleaning the pool of grime brought in through normal use. The shit-peddlers outside

To beleaguer your "cleaning the pools" analogy: It is not as simple as just cleaning the pool of grime brought in through normal use. The shit-peddlers outside the building are constantly convincing pool-goers to join a shit-peddling pyramid scheme so that they bring boxes of shit in to the pool. And besides that, some people just want to trash the pool for their own enjoyment.