We could both be interested in bitcoin as a tool to take wealth from one another... For instance, I may want bitcoin to fail...
Bitcoin is just a piece on the chess board, in the game of taking away wealth of your peers into your pocket ; the only "common interest" we have in such a system, is to rip off one another. This is exactly because bitcoin (like most crypto) is a speculative asset, which is exactly that: a tool to rip off peers in essentially a zero-sum game. Whether that tool thrives or breaks when doing so, is of lesser importance.
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People who believe bitcoin has no long term future are unlikely to participate in the system in any sustained manner. If you believe bitcoin is just a scam you may participate in the periphery trying to make money but logic will dictate you constantly keep one foot in the doorway. You will hesitate at being involved in anything but the most superficial manner.
Probably you will choose not to invest at all but if you do then you are likely to cash out of the system at some point choosing to take your profits and leave the "tulip bubble" you have no confidence in. In this manner those who do not appreciate the underlying consensus mechanism will be diluted and replaced over time by those more interested in long term cooperation and building value.
You post have led me to the opinion that you have adopted flawed metaphysics which limit your appreciation of what cryptocurrency offers.
A good place to start correcting this would be to understand what group selection is. Here is a basic introduction:
https://www.scientificamerican.com/article/whats-good-for-the-group/