Hard to explain all the points you've mentioned with one single root cause, but if I were to pick one I would say: people don't care anymore because they're bored.
We've reached a level of comfort for most of the population that is probably akin to the wealthiest people at the worst point of decadence of the Roman Empire. There is nothing to do, nothing to thrive for. The nation is not even working towards anything as a collective. Leaders have no interest in solving the current challenges (poverty, homelessness, hunger, etc) because they help keep the population in check.
We've reached a level of comfort for most of the population that is probably akin to the wealthiest people at the worst point of decadence of the Roman Empire. There is nothing to do, nothing to thrive for. The nation is not even working towards anything as a collective. Leaders have no interest in solving the current challenges (poverty, homelessness, hunger, etc) because they help keep the population in check.