I fail to see how psychology studies are at all useful. Like what do they teach us? The setups are always frail and the studied population is always Mechanical

I fail to see how psychology studies are at all useful. Like what do they teach us? The setups are always frail and the studied population is always Mechanical Turk workers or college students. The conclusions are always beyond far reaching. Edit: drinking game: drink every time I use the word always. I guess that's how frustrating I find this field. sigh