Yeah, we need to ban the sale of bleach, knives, draino, aspirin, cigarettes, alcohol, hammers, nails, saws, shovels, tractors, semis, trains, cars, fishing poles.
After all, we can't make any of those things 100% safe so they are obviously completely broken.
Tesla's smart summon operates at under 5mph. It's not perfect, but it's also not fast. If you are using it in a situation where you can't see the car then yes, you are at fault for using a tool in an unsafe manner.
Can it be improved and made safer? Certainly. Should it? Yes. Does it need to be completely shut off until it is? No. It can be safely operated by responsible car owners. Until we start having major issues with smart summon damage I see no reason to kill it. A rich person ramming a private plane is not a "major issue" any more than a nascar wreck is a "major issue" for automobiles in general.