Why progressive/conservative are accurate political terms

The five issue's progressivism and conservatism oppose each other on: competition, promiscuity, parenting, sexual behavior, loyalty.
Details on this can be found in Stefan Molyneux's Youtube video series:
https://www.youtube.com/watch?v=W8N3FF_3KvU&list=PLMNj_r5bccUw40CpD-JYXJyVsDYsj7ITD&index=1
Or a book:
https://www.amazon.com/Evolutionary-Psychology-Behind-Politics-Conservatism/dp/0982947933/ref=sr_1_1?s=books&ie=UTF8&qid=1514984592&sr=1-1

Both progressive and conservative psychologies are ideally suited to reproduce in their respective environments. So more direct identifications would be "from a population that has abundant resources" or r-selected and "from a population that is limited by resources" or K-selected. 'r' stands for reproductive speed, K stands for carrying capacity.

But the terms progressive and conservative are based on the cultures that emerge in modern (pretty much since farming) human cultures. The background is the continuous rise and fall of civilizations, a very old process:
https://pbs.twimg.com/media/Cy2XPPUXcAACD43.jpg
1. Hard times => strong men
2. strong men => good times
3. good times => weak men
4. weak men => hard times

What's also important to remember here is that a society as a whole isn't in the same phase. As progressives cause step 4 to happen, it mostly happens to other people, while they remain in step 3. During this time society as a whole remains (or seems to) in step 3, where step 4 seems to happen very fast when the majority of society has already fallen to step 4.

In this context progressives want to change the existing culture and make it less K-selected, thus better for the progressive.
1. Migration out into unexplored area's and try to populate them quickly. In the modern environment this translates to openness to foreigners and their culture.
2. Opposition to traditional practices (like Christianity), favoring foreign practices (like Islam).
3. Progressives are more often creative and more often artists. Along with that more likely to innovate, like with Google and the iPhone.
4. They're more likely to create new traditions.

For example I think Christianity was developed by progressives. Just as the religion of feminism is currently being developed by progressives. So in this sense progressives 'progress' society into new culture. Some of these aspects (mentioned them here) are positive. But many are negative (most not mentioned here), causing the destruction of civilization. Like how there's no benefit to rejecting Christianity if you're just going to replace it with a combination of feminism and Islam.

In this context conservatives want to maintain the current culture, because it's likely more K-selected than whatever the progressives want to move towards.
1. Likely to remain behind and compete for resources in the current location. In the modern environment this translates into opposition to foreigners and their culture. We already have to compete for limited resources, lets not bring more people in.
2. Loyalty; favor in-group interests and no value for out-group interests. Along with that they favor in-group practices while opposing out-group practices.
3. Favor competition, both within the group and with other groups. Seeking free markets and military roles. Losing is not a negative, because it means benefiting from the better quality service from the winner. So the individual is unlikely to want to change the rules when they lose.
4. Seeking to win in competition, individuals try to maximize their quality. Being of high quality, they're more capable of defending their society against foreign aggressors.

So in this sense conservatives 'conserve' the existing culture in society. Without opposition this can go too far, to the point where people have no personal freedom because you keep stacking up more tradition which people have to adhere to.

Steven Pinker is an example of an actual liberal: https://www.youtube.com/watch?v=kTiRnbNT5uE