There are so many tier 2 and 3 civilization projects we could do in the next handful of centuries that would leave a
measurable impact in interstellar space, and we just don't see any of it. (with a few potential exceptions, but there are other possible explanations for the WOW signal and KIC 8462852)
The conditions that give rise to intelligent life must be so inordinately rare...
How precious and fragile and amazing our lives actually are...
Money is actually a detriment to society. It provides incentive for war, pollution, sex trafficking, class based discrimination, and pretty much everything else wrong with the world today.