Damn near anything can kill you. Context matters. In most cases a consumer lawnmower should probably have a deadman switch. Plenty of people have been hurt or killed over the years by poorly thought out fail "safes". It's easy to make low effort online comments about safety but when someone comes along and re-uses your widget in a use case you don't expect your assumptions may not hold. You rarely have the context to determine what's safe unless you know the end situation in which the equipment will actually operate. For a lawnmower you do. When you start generalizing your control system and applying it to other stuff you don't.
Absolutist rules of thumb are worth what you pay for them.
Examples include stuff with blades, hammers, or swinging arms moving at high speed or with great force.
I used to work in a Chemistry lab, one in which one of my lab-mates once had a explosion while he heated something which wasn't what he thought it was.
I was the guy who phoned for the ambulance (and got the fire service included for free, but maybe that makes sense if you work in a lab). I went to the front entrance to meet the firefighters as instructed, after identifying myself they asked me "do you have anything dangerous in your lab?"
I was probably still high on the adrenaline (there had been a fairly loud bang and the glass side windows of my colleague's fume hood were blown out) but I recall being unable to answer that question. I think I eventually said "Yes, of course we have dangerous stuff, you have anything particular in mind?"
Context really does matter!
You might enjoy the NEC section on fire pump systems. It's a complete flip from the rest of NEC, requiring design around "Keep the fire pumps running at all costs, even if you're in the process of melting down the windings." Separate wiring conduits, handling full locked rotor current indefinitely, etc.
The logic, reasonably enough, is that if the fire pumps are running, you probably have way, way bigger problems that will be made worse if your fire pump system trips off to protect the wiring.
It's under the seat. With nobody in the seat, that had to be modified for this mower.
Me, I just don't have grass anymore. Fuck grass. It's a bunch of bougie bullshit from a line of the French Aristocracy who ultimately wound up with their heads in baskets. Maybe we shouldn't be copying them.
I've never used a mower fitting that description. On all of mine the safety handle runs the entire length of the push handle and you have to essentially let go of the mower to disengage it.