Every bus in Copenhagen has a button next to the door to lower the wheelchair ramp, but I have never seen anyone use it. I've never seen a wheelchair on a bus.
The metro and suburban trains have level boarding (the platform is at exactly the same level as the floor of the train so it's very easy for a wheelchair user to wheel themselves in). I've still only seen wheelchairs users on these trains once or twice.
I suspect wheelchair users prefer to call the disability taxi service. It's free for wheelchair users and blind people [1]. I don't know if this service is more or less expensive to provide than adapting buses and trains, but it is probably easier for everyone.
That's relatively similar to how my local (US) municipality handles disabled passengers. All of the big infrastructure supports wheelchairs, but it is only occasionally used. Disabled people are served by mini-buses which operate point-to-point and charge them the same fare they'd pay for the big bus.
Wheelchairs, sometimes multiple, are on Chicago buses all the time. Also rolling grocery trolleys, walkers (especially for dialysis patients where they have a medical functions) and also old people whose legs don't work so good and need the bus lowered.
This honestly makes a lot of sense, particularly because the number of people that need wheelchairs is so much smaller than the general population.
I visit hospitals pretty frequently and while it's not never that I see someone in a wheelchair, it's not every day and it's definitely not a majority of the visitors.
When I'm out and about in public, I basically never see wheelchair users.
It makes sense to simply have a taxi service instead. Far more convenient for the wheelchair user and you don't need to retrofit every bus with wheelchair access.
You can look up the NYPD report on crime for the month of june the total amount of reported crime was 427 for all forms of transport (metro, bus, etc). 3.6 million people use public transport in NYC daily.
No matter where you are, you'll never drive that number to 0. But if you wanted to make it better then you'd stop positioning the police to catch turnstile jumpers and you start positioning police to ride public transport during low ridership times to prevent incident.
wheelchairs are hard - but the driver strapping them in is robbing everyone else of their valuable time so we need a better soultion anyway