You imply nobody did it until a bin appeared. Some of us do clean up when we can, regardless of dog bin, which incidentally is usually full and needs emptied, ironically probably making it more of a health risk than if the crap is randomly in the bushes/long grass.
For the record, dogs seem to be a prize subject on this forum and have seen plenty of the above before, so just getting my punches in first, like.
The significant amount of dog crap on the field played a big part in the school which owns it fencing 75% of it off altogether, barring public access to all the locals who had used it for running, picnics, sport and walks for more than 40 years. The open access part is right by our house, which is great for my kids playing on the field.
Putting the bin in has certainly helped a lot. It's emptied every Monday morning. There were always plenty of dog owners who cleared up but a significant minority who did not. I asked a local builder to clear up after his GSD after I saw it crimp off a massive pile of poop, only for him to lie to my face & say it was not his dog wot done it as it was freshly steaming !
I like dogs - I shoot - and love seeing them at work. Many of my friends have dogs and they come round & are very welcome.
I would have a dog if I thought it would have a good life at our home, but it'd have to spend too much time alone whilst we're out at work.
Of course they have to take a crap and the majority of dog owners, thankfully, clear up. It's just those who let them off the lead and pay no attention to where they go, who get my goat a little.
Open plan front gardens - it's in the deeds - don't help, and my neighbour's child and mine have both been knocked over & pawed by an "over-friendly" dog, which is pretty scary for them. They've also been chased indoors and attacked by a barking jumping boxer dog whose owner was too chicken to come through the gaps in the hedge and into our street to get the dog back under control. I had to chase it off whilst the owner stood 25m away feebly calling it. No hint of an apology for terrorising small children.
There are occasionally off-the-lead & out of control bull terrier types which will also chase the kids (try telling a 9 yr old not to run from one of those). I have dashed onto the field mentally preparing to do battle in the past and I expect I will have to dash out again in the future.
Just like cyclists & motorists, some dog owners are cockwombles, but the majority are perfectly nice & sensible & considerate.