@HR
So where is it safe to operate a single engine plane? Only over wide open plains or within gliding distances of airfields?
Aviation isn't a public government funded service like a bus route. So on low passenger routes how can you justify running a twotter over a van or porter into mountainous strips?
You can do it, but as a business you won't make any money at all.
You can go on about single engine this and that. But people get killed by poorly managed single engine events in twins.
And then we get into more people being killed in CFIT and other human factors related incidents than engine failures in single engine aircraft.