Seems reasonable that an alien craft travelling between stars might want to illuminate the whole star system to detect dark objects and plot a safe or more perfect course.
Apparently Wow! came from the same area and seemingly was blue-shifted by an amount that could make sense from an approaching craft, so that doesn't sound that silly to me.
Unlikely to be the real cause, not silly.
> and seemingly was blue-shifted by an amount that could make sense from an approaching craft
What do you think the natural spectrum of the Wow signal was, for determining amount of blue shift? What resolution of spectral data do you think we have on it?
How is it "illuminating the whole star system"?
It seems more likely that it'll act like a non intelligent hunk of rock going through some random trajectory.
It's less silly to declare you'll win the lottery. That has happened many times over - but we're yet to discover that can or has existed outside of Earth. While it's nearly impossible it hasn't happened several times over, it's so far impossible that we've encountered even the crumbiest excuse for life.
I assert that it is silly. We're not indigenous American happening upon European settlers. We're indigenous Americans wandering about the continent harassing mammoths, inventing stories of how it'll go when it happens.