I know you mean well but I don't need a lecture on economics or on the iniquity of the prevailing monetary system. I am well aware of that iniquity. What you need to realize is that bitcoin means different things to different people. Some people are committed to bitcoin as a political phenomenon that represents economic freedom, and you seem to fall into that category. Some people are just curious about it some people are interested in it from a technological perspective (interested in the cryptography). Some people are just interested in speculating in bitcoin and have little if any interest in its political implications. Without further information I have to assume that the guy who posted asking whether bitcoin is a good investment falls into that category, as do you.
I agree on your point that people have a different meaning and based on the resources I have posted, the answer is simply no and the reason is that Bitcoins liquidity is dependent on fiat currencies which can either rise or fall based on speculation. It's value is also determined by confidence (Look at bitfloor's case when BTC value slumped) which is what I was stating before on my post. If Bitcoins was backed by "the gold standard", then I would say it is a "safe" investment.
What I wanted to demonstrate to the OP is the underlying reason of why Bitcoin was created; it represents freedom from central banks which is what we really need.