No one encounters 10 misplaced scooters in a 3-4 minute walk, and it would take under a minute to move a single scooter. That's a very unrealistic hypothetical.
I guess you've never been in SOMA in San Francisco. I used to live in that neighborhood and in the 3 block walk to the coffee shop I could easily pass 20-30 of them. In my current neighborhood I'll see about 6 in the same distance.
You passed 20 scooters blocking your path in a 3 minute walk?
I lived in SF when the scooters first appeared. Maybe it's gotten worse, but I thought they made you prove you parked it somewhere legally with a photo. So I would figure at least the majority aren't just blocking the sidewalk.
I'm not saying they aren't misplaced a lot and that it isn't a problem. I'm just saying there's no way every 10 seconds you're climbing over a scooter on your walk (20 in 3 minutes).
I think you underestimate the number of people who are careless and inconsiderate. Or maybe you live in a very nice part of town. I sometimes get stuck doing 8 things on the way to do a thing I intended to do, because I see a thoughtless thing and cannot help myself from fixing it. It's important to higher functioning to be able to look at a thing wrong and say "not my job to fix it!" without guilt.