Exterminate!

Between finally catching 5 Million Years to Earth (a.k.a Quatermass & the Pit) and watching a ton of Dr. Who, I'm curious as to what the timeline for each franchise (because Quatermass was a franchise, for a short time) and their various successes have to say about British science fiction and popular taste about science-fiction in general.

Hypothesis: The Quatermass series' subject matter is generally the failings of man and nature, and how man's organizations worsen those traits. Dr. Who's subject matter is the wonders of man and nature, and how most problems are best solved by an individual's bravery, compassion and intelligence. So Quatermass' success suggests a period of disillusionment or uncertainty, Who's success suggests an approaching period of optimism and excitement.

Just an idea. Anyone with any opinions on this? I can already see some flaws with the societal interpretations I've suggested, but anyone with a counter-argument about the way I've characterized the two franchises?
Quatermass & The Pit
Quatermass 2
Doctor Who: The Complete Fourth Series
Doctor Who: The Complete Second Series
Doctor Who: The Complete First Series