In the same way, if we want to achieve our goals, we’ll be looking for the best plan possible. A better plan is one that has a higher chance of getting us what we want. So, to solve complex, global problems, we’ll need a great plan.

How do you know those things that you claim in that paragraph?

Everyone that came before you who wanted to make a difference probably had a fairly good notion of what the problems were, but how many of them actually took the time to really research/create a strategy of what to do about it?

Marx did research and he had a plan of how to make things better. It turned out that trying to put that plan into reality didn't really turn the world into a better place. Hitler also had his masterplan.

In the later part of the 20st century there was the sentiment that this isn't a good way to do things.