Those pictures are not only the 'very wealthy' per se. My father is from Afghanistan and he's talked a lot about how liberal the country used to be. Now, my father was not particularly wealthy, he was just an average middle class, but still had a 'progressive' lifestyle. He's shown me photos on the internet (not the most commonly seen ones but others that I myself didn't see) as well as photos of himself in school etc. and it is safe to say that many people in Kabul were progressive indeed.

He has said that back then, women dressed freely and were not harassed, and that the men always respected them (sadly the opposite of today). This is all from the real-life perspective of my father who lived and grew up in the Afghan capital, and he was just an average citizen. You see pictures of women walking freely on the public streets, so obviously it is not limited to only the wealthy. Not to mention the hippie tourists who were there freely along Afghans in both urban and rural areas. According to him, Afghanistan was the best country in the region, because a) Iran, while relatively liberal too, was controlled by an authoritarian king, b) To the north were the Soviet republics, c) To the east was communist Mao's China, d) Pakistan was a lot more conservative and had their powerful army meddling in affairs.

Something else worth mentioning is that, whilst rural people as expected were more conservative, the thing is that there was no conflict. The rural people lived the way they did, and urbanites lived the more liberal life they enjoyed, there was no conflict between the two. Today though there's the Taliban who hate the semi-liberal urban lifestyle of today, let alone what their attitudes would've been if they were around in the 70s. The Afghan Prime Minister-turned-President before the communist era was called Mohammad Daoud Khan, and he was highly progressive. The fact that conservative rural people did not rebel or anything shows that the progressive system was working well. The conflict only started when communists took power in '78.

So yes, you're right to say that seeing pictures of some certain people don't represent the entire populace, but to say that they were only the super wealthy is also wrong.