The needs of the many outweigh the needs of the few.
IMO, the security is trying to maintain the comfort of some while the majority of people are being suppressed and told "yeah sorry you have no were to go and your watching your children starve but we are full". I just think in that situation I would side with the refugies even if I was rich and happened to take a vacation to the arc before the world went to hell. Just doesnt seam like the kind of situation where somone says "dibs" and everyone else is just suppossed to jump back in the water.
You assume the Ark's supplies are limitless. As said earlier in the thread, the Ark was built to house 5,000 people - not 55,000 people. If you let everyone have equal shares of what can be sustainably produced, how fast will you burn through your remaining supplies? How much faster will the supplies run out, and people start to die? Or do you skew the shares each claimant has to the supplies of the Ark so that you may buy time to find a better and more suitable solution to the issue of sustainability with a signficantly larger population than foreseen?
Who has the right to those supplies? Does everyone? Do some people have more a right to the supplies than others? The original population paid for the material right to those supplies - the original Ark population also created the possibility for the supplies to exist at all. Without the original populace those refugees would probably already be dead, no?
You're thinking of the needs of many, sure, but what of the needs of the future? Do the many still matter if there is no one left? Do the morals of now still matter if there is no one left? How about when everyone is gone, do morals matter still?