Our brains are significantly more complex than a mouse brain but the base instincts are still there. thousands of idologies, political topics, and factors go into our reasoning and actions. but at the same time the things we do boil down to simple instinct. We get up and walk over to the fridge for a drink because our brain says it wants some sugar. We browse throught poal every day because getting a reply gives us a dopamine hit. and people decide not to have children because the society is dead. they may say they are not having kids because of financial reasons or to save the planet or because they dont want the responsability of raising a kid. but the real reason is the unconsious one.