This is subjective. I live in a city that has at least five brands of scooters, and I work downtown where they are most densely clustered. (Not only that, it's a popular area with tourists, so it's an eternal September of scooter use.)
Some people here feel exactly the way you do; others think they're great. Some people consider them a nuisance to pedestrians; I walk on the same sidewalks and rarely experience a need to step around or over them. Some people feel terrified and menaced by them; I use the same streets and sidewalks, and for me, scooters barely register next to the danger posed by cars. Some people think they take up an inordinate amount of space; I think you could fit all the scooters in the entire downtown area into half a block's worth of street parking. You think they're toxic and don't improve society; I think they decrease the number of car trips and (in combination with Lyft/Uber) make it affordable for a lot of young people without tech jobs to live in expensive cities by making car ownership less necessary.