Originally Posted by Enixon
I'd like to refer you to my post on that subject
(look in the spoiler).
TL;DR: Even if there are extra things that are possible in a fantasy setting, everything else works exactly the same as in our own, so why should we assume that those parts work differently?
Originally Posted by LudicSavant
Also true. Though arguably less relevant to the anti-physicists' point.
Originally Posted by Amaril
Science doesn't work like that. If there's something which violates the apparent laws of physics, scientists don't throw up their hands and declare that this is something that doesn't make sense and shouldn't happen—they leave that to philosophers and theologians. Instead, they quantify the something and try to understand where they went wrong when describing the laws of physics.
This exact thing happened with neutrinos, though on a less interesting scale. Conservation of energy and momentum seemed to be violated, so the scientists worked to figure out why; they made theories and figured out how to test them, and understood the universe better as a result. In a world with magic, the same thing would happen—except these "violations" would be incorporated into the laws of physics from the very beginning!
And just because people conclude something is "random" doesn't mean it necessarily is; there could well be patterns they haven't managed to figure out. A lot of biological patterns started out this way, such as species distribution ("Why are these species here but not there?"); then evolution and continental drift and so on came along, and we could piece it together, and now species distribution is...well, it's not as certain as the orbits of the planets, but it's still well-understood.
Originally Posted by Bohandas
And the funny thing is, Discworld is the closest thing to "Magic doesn't follow any kind of proper magical laws" that I can think of.