That's like saying that the best argument against capitalism is a five minute conversation with the average person about how he decides to buy things.
Or, in other words, Fallacy of composition .
Just because individual voters vote poorly (or because individual purchasers only buy things based on how cheap they are) doesn't mean that democracy (or the market) don't work.
Also, remember that Churchill was a colonialist and opposed the independence of India.
Test: find someone who just voted and ask the person to (a) justify their vote, and (b) justify the purchase of some large ticket item (cell phone, car, house) they made. I bet they make more intelligent arguments for (b) than (a).
Another month has passed and here is a new rationality quotes thread. The usual rules are: