Yeah, I recall meeting a US guy in Nepal high on Annapurna circuit trek (meaning the person was not as close-minded as many that didn't travel much, he did intensively over whole world before) around 2008, he was praising US invasions in Iraq and Afghanistan stating something about how local population would make great christians. He was a Texan and big supporter of GW Bush. That left me speechless for a while.

Sample of 1, but it clearly showed me that with some people, you just can't get the message across. Doesn't matter how smart they are, what they experienced, it just doesn't work. I tried (not too hard though) and failed.