There again this isn't quite correct, if you want to sit in the empty seats you can. The seat savers are assuming that insisting to sit there will make you so uncomfortable during the flight that you will just move on and let them bully you. You really seem to be coming down on the side of aggressive behavior yourself. Its correct that SW flight attendants normally won't intervene against seat holding hogs, but that doesn't make it right. They allow it because they count on those of us who were raised properly to move on and not make a fuss.
If your motto is we should all get along, then you might address the behavior of the beach chair hogging and seat hogging entitled ones, who actually are the root cause of these problems.
I don't save seats on Southwest or at the beach so it's not me. When I am on vacation I actually like to relax and merely laugh at the people creating problems. I get to the airport early so I am not worried about missing flight (even though I have Pre), I get a drink, I read the paper. I am on vacation from moment one. I merely find Southwest's policy, of no policy, very interesting.