Let's examine the scenarios in which the Room has appeared. In Hallows, students face immediate and brutal, albeit non-lethal, physical threats. The Room also acknowledges Neville's need that the Death Eaters and their followers must not be able to access the Room and discover them. Draco pulls the same trick when using the Room to plot Dumbledore's assassination in Half-Blood Prince, ensuring himself privacy. This implies that the Room is indifferent to the morality of what occurs within it, assuming that it even understands the concept.
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The question of whether the Room can be considered sentient will be covered in part four of this investigation.
But what about Dumbledore's Army? Harry and his followers didn't need to fight back against Dolores Umbridge's corrupt control of the school, and they didn't need to organize and train in the Room. But they wanted to very much, because they felt it was the right thing to do and the best location in which to do it. Had they stayed out of trouble, there would have been no immediate physical danger they needed to avoid. Yes, the wider Wizarding World would have suffered for their inaction, but if that was the Room's basis for allowing them access, why would the Room later allow access to Umbridge's goons, led by a student who "needed" to betray her friends? Again, the room appears either indifferent or ignorant to rules.
Most other examples are anecdotal, but they support the idea that a "need" is really just a very powerful want. The Room is first alluded to by Dumbledore, who discovered it when he really needed a bathroom. But despite Dumbledore's advanced age, we're never given any sense that his body is failing. So we have no reason to believe that he couldn't have made it to another bathroom, or even conjured up a magical solution. The Room was simply more convenient.
Dobby uses the Room to help Winky sleep off a hangover, and Filch, the caretaker, discovers cleaning supplies in it. Neither of those are a "need" -- Winky would have just been embarrassed or uncomfortable elsewhere, and Filch would have merely had to make a longer trek to find supplies. Again, the Room is actually responding to a desire for convenience, not an immediate physical necessity in the biological sense.
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Did someone really need to store all of those chairs and cupboards? I think not.