This is somewhat confused.
As far as I know, we don't have ravening hordes of scooter-poopers (regardless of housing status). Some folks pooped on them as a statement, pics went around.
Yes, especially in SOMA, where both the homeless and the scooters are plentiful, one encounters poop. But otherwise, there's no real relation.
The scooters are somewhere between annoying and a menace, depending. I tripped over one two days ago; there's a dark stretch on my block, so of course that's where someone dropped the damn thing.
My issue is with people who think the commons is there to be exploited. If your business is going to occupy and use public space, it needs to do so only with the consent of those impacted. It not, why shouldn't I start occupying the sidewalks to hawk my goods and services, too? Why stop there - there's a lot of street to take over, too, not to mention all those parks, just waiting to be DISRUPTED!
I find it especially ironic that the homeless, forced to live on the sidewalks, are being blamed for problems with scooters, whose owners are competing with the homeless for the space.
Haven't taken part, but I have no issue with the folks who have been destroying the scooters. It is a useful form of feedback.