I babysat my 9 month old sister when only 10 myself, while my parents drove an hour away to enjoy themselves all afternoon, so who knows, eh? But my point is that 4 year old children in Switzerland have to walk to school unaccompanied by adults to foster their spirit of independence, which IMO puts them at higher risk of wandering off, having an accident or being abducted than if the same kids were tucked up in bed asleep at home and left unattended for periods of up to 30 minutes. No doubt you strenuously disagree!
It is not my job to dictate to parents in any country how to bring up their children- why would you think I have some responsibility by agreeing or disagreeing?
in your opinion you state 'puts them at higher risk of wandering off, having an accident or being abducted ' If you google Swiss embassy and let them know you have taken a risk assessment and are concerned about child safety and parental responsibilities, I am sure they will take your concerns on board- OR maybe not.
There is no comparison so stop trying to make one. IF the Swiss parents were leaving their children alone to go out drinking then I would condemn that behaviour. I would doubt if a child was abducted such parents would set up a company ,and go 'walk about like celebrities' and do the jogging, blogging, bragging bits.
There would be no issue with a time line either...