Your seat belt analogy is invalid. Driving past a certain speed is always life threatening. Even if you driving on a non-life threatening speed, you share the r

Your seat belt analogy is invalid. Driving past a certain speed is always life threatening. Even if you driving on a non-life threatening speed, you share the road with other people that might be, worse, these people might be drunk even though your sober. Wearing a seat belt is a low cost highly effective way to reduce the risk of dying while in traffic. The reduction is significant. Usually parents share beds with their infants in a low risk and controlled environment. If the parents get drunk one night, it is easy for them to postpone the practice that particular night. Always putting the baby to the crypt is a high cost low yield way of reducing the risk of SIDS. The risk reduction is puny. A more apt analogy would be if you always drive on your own private road no faster then 15 km/h, except once a week where you drive 120 km/h on the motorway. Your car has a 5 point seat belt and is a pain to put on. A sensible person, and a sensible advice is to put the seat belt on that one time a week when you drive on the motorway.