This is drivel, and a total misunderstanding of the scientific method.
The burden of proof is on the person making the claim.
Otherwise you must accept any old bollocks as plausible, as it's impossible to prove a negative.
There is no reliable evidence that there is any supernatural phenomena, ghosts or otherwise. Until there is such evidence, we can safely file them along with alien abductions and psychokinesis in the "implausible and unproven" category and ignore them.
I think that you're being overly dogmatic. I am reminded about Antoine Lavoisier's dismissal of eye witness accounts of meteorites falling out of the sky, using very similar reasoning.
You most certainly do have to consider the evidence, as you say. In this case, it is much more awkward because the evidence, such that it is, is not physical and is composed of eye witnesses and peoples' impressions of what they experienced. That certainly does not mean that it is nonsense or can be dismissed. Rather, it is better to ask the question: why do so many people report what are quite similar experiences? That is a more interesting question rather than mere dismissal.
What is the common element in all this? Well, it is all experienced by people, and there are no obvious physical changes. That might suggest that there is something psychological going on. Let's take a look at what the OP said. The warehouse is large and drafty. These are ideal conditions for low frequency standing waves to occur: this is something that can't be heard, but can be felt. What is more, they have been shown to produce feelings of a ghostly presence to those who have been exposed to them. This sounds like a good explanation for the warehouse ghost stories. The open window would also be sufficient for substantial pressure differences to build up across the closed door. A door has a large surface area, and that will add up to a large forced being imposed upon it with even a small pressure difference - certainly enough to force the door open even against the weight of the ornament used to wedge it shut. That would leave the ornament moved a couple of feet backwards - exactly as described. So in this case, I'd say no ghost.
As I say, I don't think out and out dismissal is appropriate - I'm sure there is useful information to be gleaned about human psychology at the least. That does not necessarily mean anything supernatural is going on, but rather we don't understand the physics and biology of it - yet.
PS: I'm quite skeptical about ghosts myself...