Non-Conservatives can be conservative on many points, thoughtfully so and not "unthinkingly", as he would have it. They wish to conserve what is valuable for the many - the health service and social security, an education system open to all and free speech in the media; along with other institutions and traditions such as the Post Office and the right to pay bills in cash.
Maybe Conservatives all have telephones, fax machines, e-mail facilities and bank accounts which are always in the black, not to mention private health insurance and an educational trust fund, and therefore don't need to be particularly conservative.
G K Chesterton - not a Conservative - once wrote: "Only a fool says, `This is good because it is old'. And only a bigger fool says, `This is better because it is new'."