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Then why the hell do they have a weapon? (Remember, kiddies, cars are weapons, so don't use them immaturely!) Sell the damn thing and take the bus all the time, or freaking walk or carpool. And if you have to get groceries or stuff, bring the whole family along so they can carry everything. Hell, there are also plenty of charities willing to help for nothing and plenty of good samaritans who'd lend a hand. I found PLENTY of ways to get around while not owning a car when I did my Poverty Project; if these people aren't smart enough to figure out similar or better ways... I guess it'd be natural selection at work. We're too overpopulated anyway. (The last two sentences were jokes, since no one ever seems to get them. Though honestly, if they aren't even bright enough to figure out at least one way to get by without a car, Idek.)
Overall, one less vehicle on the road means one less contribution to global warming. Even the smallest changes can affect an entire country.