It's a great sentiment, but most poems don't impact society, unfortunately. Advancement and monetary gain do. Horse and carriage were no longer as profitable than motorized vehicles, so historically, pedestrians got the short end (figuratively and literally). Now we're in a society that is dependent on cars. And I'm in no way trying to criticize your opinion on saying "fuck cars", but it's a harsh reality of what society is right now. If we did away with cars and trucks, then it would shut trade down inside and outside a country. The economy would take a massive dip, and (IMO) would either be the start of another depression or would make the trade market bad enough to destabilize to the point where it's irreparable. Yes, some trade markets are not exactly necessary, but there would just be someone else to replace the merchants.