We are at the age of engineering human behavior and societal engineering is in the realm of STEM. social science is like alchemy in an age where chemistry already exists
However, I can do these things without studying social science. Basically what you described is "talking to people" and "gathering information"
We are definitely not. I'm saying that as someone researching how to use computational methods to model human behavior. We know very little about human behavior/mind/brain or society at that level.