Mmm, just to clarify: this wasn't me and my ships don't pirate at all. This kind of behavior gives very bad name to those players who work hard on roleplaying those damn things, myself included.
However because of lack of RP of some of those players you don't take all other ships from the game, starting with Liberty Battleships and every other, so why specifically those?
It's just another example of nomadophobia. If you can't see how they can be played - don't even touch them, stay away from those and buy something else. If you see someone using them but not roleplaying - report them. Quite simple. But asking to remove them completely is wrong on so many levels.