That we have not looked long or hard is why we have not (yet) found a signal. Interacting with an ETI will be much more problematic than finding a signal, given

That we have not looked long or hard is why we have not (yet) found a signal. Interacting with an ETI will be much more problematic than finding a signal, given speed of light issues. Or did you misread the OP? He believes ETI is pervasive, which seems a reasonable conclusion to extrapolate as Kepler fills in the F(p) and N(e) terms of the Drake equation.