How to interact with a police officer(s)

My grandfather was a MN State Highway patrol officer for 16 years in the 50s to early 60s. And he never once pulled his revolver in the line of duty. And no. Times are not more dangerous. Statically speaking. I asked. What is different? He said. "Training." Police are now trained to use their weapon more as a tool of control and force. And this was in 1984 when I asked. Now? Its gone mental. In the past 10 years I have been pulled over. Made to lay in the street hands out. With semi auto rifles and pistols pointed at me. Because I somewhat fit some description? And I'm an old suburban white guy. If I was a black guy? I would be scared to death. Something is wrong?