I can understand a concern for elderly parents, and the damage they may cause others.
If there are obvious serious deficiencies - visual or other - it would be irresponsible to allow them to continue driving.
But one of the worst aspects of aging is increasing isolation from society, friends and family. Living in a town or city with everything close, decent public transport or short taxi ride, means giving up driving may even be a benefit (less stress).
In more rural areas, small towns and villages, or with dispersed family and friends, stopping the elderly from driving, unless abundantly necessary, simply hastens their decline.
On a very philosophical level - living is more than preserving biological life - it is about friends, conversation, family, enjoying a meal etc etc. Put bluntly, the threat of physical accident may be far less than the consequences of isolation.
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