Why would this be a waste of public money Bhanu? The buses run on set routes, they are going to go that way whether they have passengers or not, as do the trains. If the Pensioners were to use cars instead, not only would this result in more traffic congestion and pollution, the possiblity of more accidents from age related illnesses, or older people being too afraid to drive so they remain cooped up at home, resulting in the need for more social support and hence - state funding.
I think it makes perfect financial sense really!
Bless you!
Nessie x