In arguing like that, however, we lose an – to my mind, important – distinction, namely that between contingent propositions that are known to be possible and contingent propositions that are merely not known to be impossible; the claim ‘donuts may be falling from the sky outside’, if I understand you correctly, is just as contingent as ‘it may rain outside’, yet, to me, of a fundamentally different kind, seeing how rain is sufficiently well-documented as a natural phenomenon, yet falling donuts are not.
I’m not sure how much I can agree with this quote, since it seems to assume (non-trivially, to my mind) that the answer we get is actually dependent on the type of question, while it seems to me that it may well be the case that all questions one can meaningfully ask about nature eventually lead to the same answer.
However, these would then appear to be causeless effects, which – at least on a macroscopic level – would be quite remarkable in itself. Also, if the effects originated by said metaphysical agent follow any sort of – arbitrarily complex – rules, they would be fundamentally indistinguishable from physical law; and if they are not, they would appear to be random, which seems problematic to reconcile with the notion of an intentional action.
It’s at best tangentially related to the point you’re making, but, since I’m on a bit surer footing in quantum physics than I am in philosophy, that’s not quite what happens – according to current understanding, the fact of the matter is simply that the location of a particle is never all that well defined, so there is really no way to meaningfully claim it is either ‘here’ or ‘there’, at least not until you actually perform a measurement. So there is no actual change in location; it’s merely the case that, until the particle is measured, it is not actually localized, and the measurement then has a certain chance to find it at certain places depending on the configuration of the system – there are ‘forbidden’ places, i.e. those where the probability for locating the particle is zero, even in the quantum world. However, generally, yes, it is possible for a quantum particle to be located (by measurement) arbitrarily far from the point of maximum likelihood for its position.
Possible, but not the first explanation I’d consider – a glitch in the matrix, provided the simulation argument is true, might be more reasonable, or probably I’m just going insane (it’d not be the first time I’d be forced to consider that possibility). But still, yes, it’s a possibility.
Well, science would tell me that there is no need for any action, and thus, for an agent. And – here I should take care not to speak too definitively lest I overstate the strength of my position as well as the extend of my knowledge – it could also conceivably tell me some things about a putative agent, should one exist: it is one of the most remarkable results of modern quantum physics that it is incompatible with what’s called a (local) hidden variable theory, i.e. one that would state that the properties of a quantum particle are actually definite, yet merely ‘hidden’ from our inquiring minds (this is due to Bell’s theorem and experimentally confirmed violations of Bell inequalities). In other words, no agent can locally have knowledge of those properties, yet presumably such knowledge would be necessary in order to facilitate any action. However, it is possible to construct non-local hidden variable theories consistent with the findings of Bell experiments (Bohm’s interpretation of quantum mechanics would be such a theory). But, on the other hand, non-locality is thought to be forbidden by relativity, which maintains that (causative) influences can’t travel faster than light, so it’s difficult to see how to make such theories consistent with that.
Anyway, lacking as we do a consistent theory of quantum gravity, there is little use in me trying to pretend any of the above were truly definitive; but, should a complete physical description of reality be possible, and should that ever be found, it may well be the case that it posits definitive restrictions on anything wishing to act on reality, and it could well be the case that it would say that such quantum effect cannot have an agent behind them. (Take the preceding as marked with a bold ‘IMHO’, it’s 2 am and I may not understand these things as well as I would like to think.)
I’m not disagreeing with this; however, it may well be that science actually can say something on whether or not metaphysical agents can interact with reality at all.