PoBs are like guns - while it is true that the main responsibility is with the owner of them and not the PoB itself ... they do make it much easier to cause problems when they are rather freely available.
but whats the alternative. - being led by the hand for each little thing that can cause trouble? ( well, in terms of guns that probably a preferable option in RL )
in the disco enviroment - players are mainly responsible for what they do. - if they wish for more roleplay and less dumb pvp only, they must start with themselves - same with PoBs.
the problem in that case is that PoBs make it easier for the players who are disruptive and trollish to get their way - but it is up to the community to regulate it. - disco is not kindergarden - problems are expected to be recognized by the players themselves ... and also solved by them.
PoBs are a great opportunity for roleplay, interaction and "real" achievements for even smaller factions. if that opportunity was to be regulated too much by like admins or other "higher ups" - it would simply go away.
one last thing ... @ryoken: to say that "zero thought" went into PoBs is quite an insult. - PoBs had been discussed extensivly within the dev team, much more than many many other things. - but it is impossible to predict all the exploits human nature comes up with and the sheer will to harm other players gameplay.
even now - the benefits outweigh the problems they cause. and i am quite frankly at a loss why some factions are simply so reluctant to remove disruptive PoBs that really affect their reputation in a negative way inRP.