In the long run resource shortage goes down. Technology increases the amount of output possible for a given amount of effort over a given amount of matter. For

In the long run resource shortage goes down. Technology increases the amount of output possible for a given amount of effort over a given amount of matter. For example: wood to coal to oil to nuclear. Thinking about starships of 3000 AD we're talking about a thousand years of scientific development towards nuclear reactors, food processing, scientific computing, and random technologies I can't even fathom because they'll rest on a bed of mathematics and physics that's not even conceivable yet. If more technologically advanced aliens exist then our not sensing them is much more likely because they don't want to be sensed than some other consideration like them stopping to setup on some habitable planet. I'm horrified about war, and I'd hope they would be too, but it may be that aliens come to understand species or ecosystems in a more expansive way and may consider the process of ending war as a necessary one for the maturation of an ecosystem. Or the great filter is true. We all end up killing ourselves because it's impossible to escape exponential technology growth and mismatched incentive problems, or something else like that.