Kill switch necessary?

[prodigit]

My Roketa MC-05-127 comes without kill switch.
Never needed it. There's always the ignition key; true less easy than a kill switch, but I've never needed one, and probably never will.
Same with a car, some older cars still have a throttle cable connected to the throttle pedal, and even after 100.000 miles of accelerations, it still is working just fine.
Never needed a kill switch on a car, so on a bike I won't need it neither.