Ironic Bumper Stickers

I have to wonder whether the driver's of these cars have a sense of humor, are altering the meaning of the message, or are just ignorant of their own irony

"5% Of The World's People Consume A Third Of Its Resources & Make Nearly Half The Waste. That 5% Is Us" was seen on a Chevy Suburban in Flagstaff--were they bragging?

"Born in the USA" on the back of a Toyota Tacoma--technically these days probably true--but certainly not conceived in the USA.