Blind Altrusists vs. Blind Pillagers
Self Impact tweaks how much a giver loses when it gives, and how much a taker gains when it takes.
Social Impact tweaks how much a giver's neighbors gain when it gives, and how much a taker's neighbors lose when it takes.
When Social Impact is greater than Self Impact, you have positive-sum giving (net resource creation) and negative-sum taking (net resource waste).
Press F5 to start the simulation over. Quite often everyone goes extinct!
original Java version here.