But what's the merit of knowing?
Most people don't know about economics and finance either, how is that working out? The problem is, knowledge is power as it affects behavior, and when only a small fraction have the knowledge, they can affect the behavior of the masses.
but I really feel sometimes ignorance is bliss. Especially when we're talking about trivial things like daily life.
Not necessarily. Not knowing doesn't mean one isn't influenced by something and when one knows that they are affected but don't know what is affecting them - that is a suffering. Again with the economy, people suffer not having enough and blame all kinds of things, yet - they don't actually know, if they did - they would change their behavior.
I see "knowing" as more than knowledge in the head, it is practical.