Give me some cites. And define small.
There's a vast literature on induced seismicity from well injection - just do a google search - like I said the most famous instance was injection of waste in a deep well at the Rocky Mountain Arsenal near Denver in the 1960s.
The other main cause of human-induced earthquakes is the filling of reservoirs.
Obviously activities like this don't generate Magnitude 7+ earthquakes, and most injection caused quakes are quite small - there have been some reservoir-filling quakes that have caused damage, though.
I suspect your proclamation that even investigating injection as a cause of earthquakes in Oklahoma was "asinine" wasn't based on a careful review of scientific literature.