"I mean no offence to anyone when I say this."

No offense taken, I don't get offended by insults, I get offended by foolish people. :)

"Why do you think "ignorance is bliss" is a bad idea?"

It's easy to, at this day and age, stop and think that all this questioning and doubt is unneccesary, what harm could possibly come from believing what we prefer to be true? Well, for one, I'd point out that the scientific drive to discover the nature of the universe led to the car you drive, the computer you're currently typing on, the polio vaccine you took when you were a kid, the antibiotics that saved your life from strep throat, and so on, and so on. If a society wishes to survive and prosper, it cannot afford to be ignorant. A society that tries to cultivate crops in fertile topsoil stands a better chance of survival than one who makes a field in a desert. As a whole, ignorance leads to death.

Ignorance is bliss only if the rest of the population cannot afford to be ignorant, and you're just along for the ride. Once the blind are in the driver's seat, we're in trouble. To let the powers-that-be deal with the messy nature of science and learning, and to just go with the flow, may work for some people but it's an inherently selfish ideology. Subjectively speaking, I myself have a huge psychological drive to understand as much as I possibly can. That may not be true for all people, but there you have it.