Genocide is never acceptable. Anakin killed them all. He didn't cut a swathe to his mother, he brutally killed those involved, and murdered those uninvolved. He not only killed the guilty, but the innocent as well.
Let's be honest for a second here.
All Tuskan Raiders are *****, and have proven to be always be *****. Every single time they have been depicted in the series, it is usually as hostiles taking pot shots at travelers for fun or for murder/theft like, well, raiders.
I say, Kill em all.