Seattle's public toilets: a public nuisance?

Seattle's automated public toilets have not been the boon to the city that officials had hoped for two years ago. The toilets give users ten minutes to do whatever they are doing before the door opens automatically. The inside is then sprayed with cleaning fluid. But despite this expensive plumbing venture, the number of complaints of human feces on the street has actually risen sharply [1] in the two years that the toilets have been in place. Even the homeless who hang out in the city's historic Pioneer Square area don't like to use the public johns. Why would this be?

Many "traditional" toilets have become hideouts for prostitutes and drug dealers in urban places. The manager of the Grand Central Bakery likes the auto-open, auto-disinfect toilets because drug users appear to be using them to shoot up in instead of doing it in her bakery's restroom. Evidently you can shoot up in less than ten minutes; but what about actually using the toilet?

Why is there more poop on the streets?

Are people afraid that they won't be able to finish in the allotted ten minutes and they'll be exposed and hosed? What happens when the door opens and someone is still inside -- does the person get sprayed as the interior is disinfected? (This could be useful. If you're homeless and a little grungy, could a person strip down and then wait for the disinfecting spray? Would it be tantamount to a soapy shower? Of course, the door would be open, but you'd be clean. With a lingering scent of pine.)

I suspect that some of the nefarious activities often pursued in a public privy are scuttled by the door popping open and the spray-down that comes after. So is it possible that the homeless are making a statement about the toilets by defecating al fresco?

Officials are divided on what to do. [2] Some say the city should just get rid of the toilets, even if that means continued payments on the maintenance contract; while others want to authorize advertising to pay for bathroom attendants. But how would an attendant help? The problem is people NOT using the robo-johns and crapping on the sidewalk. What's Seattle to do?