hi minnie mummy
i dont think the analogy of the handbag misses the point - its the definititon of risk
hazard - ie the severity of harm that could ensue
the likliehood that the hazard will happen
times the two together = equals the risk
so with the handbag left unattended, the hazard is not high - you lose your bag, cancel your cards etc etc may have a broken car window hassle but not too bad, likelihood of it happening, quiet high as most theft crimes are opportunist passersby.
so with your baby left unattended, the hazard is the highest you can possibly imagine, the likelihood may be low, but it remains therefore = its up to you whether you consider it a risk worth taking.
so when making your decision that it is a risk worth taking do you weight the severity of the harm that could happen when calculating your risk, or the likelihood that it will happen?
Personally, some risks regardless of the rarity, are just not worth taking in my book.
ps. the rspca frown on dogs being left in cars, even with the windows left open.
leaving the car windows ajar makes it easier to open the door from the outside.