The reason so many on both sides defend their own guy is that our society is SO sexist that the bad behavior is pervasive and accepted and as a result, it really doesn't rise to the level of behavior like other criminal behavior, or taboos.
Except that not too many people on the left are defending Franken, certainly not anywhere close to the number of people who defend Moore/Trump. So not "both sides".
In fact, this entire experience is an introduction to accountability. One side clearly accepts wrong doing and has shown remorse and a willing to accept punishment. If this means nothing, then that is why we and the rest of the rest of the world are on the verge of becoming people like Trump and Putin's property.