Let me start by saying what you already know. You are making a huge mistake.
I think this all stems from low ranking LN officers being offended because higher ranking independent officers (i.e. more experienced players with ships that have been around for a long time) are not yielding to commands that they feel are OORP, improper, or ill-advised (mostly due to the [LN] officers youth and inexperience). The LN faction must realize that they are not the only members of the Liberty Navy and making decrees like this will only alienate the houses biggest and long standing protectors.
In the hours that I am on, I rarely see very many faction LN players, and those that are there are unequipped, in both numbers and experience, to provide Liberty with any real protection. Thus, each night (GMT-8), it is left to the Liberty Navy independents to provide protection to the area. They are fearless and ruthless, but very effective. I have been saved more than once by these, so-called, capwhoring, pvp-er indy Liberty navy when my distress calls to the LN when unanswered.
It is my suspicion that many of these cap-whores will continue to defend Liberty from its enemies despite this ban and any interference with this activity would be considered utterly treasonous.