They're just doing what science does and reaffirming what science is all about: exploring God's creation. Their method of research and manner of expression may be oblique, but there are other times and places for direct experience and speech. Just as God does not reveal Himself except in ways He chooses, man is limited in explaining God's ways from a scientific standpoint.
I hardly think it is the purpose of ID proponents to prove the existence of God. They would be "seeking signs" if they expected God to make a command peformance just to satisfy their curiosity or sate their appetite for vengeance, justice, and proofs outside of the Creator's intent.
Just as science has difficulty in pinning down what constitutes a species because species have a continuity about them, it has little idea what constitutes a miracle because it was born into a continuous miracle. It is by no means normal for the particles of the universe to form together as they have and perform as they do. Occasional physical behaviors outside the norm, in view of the overall behavior of the universe, are not as spectacular as either science or theology would make them out to be.
As awesome as the more detailed picture of reality becomes (by virtue of true scientific efforts), it doesn't begin to reflect either the mind of God or His will toward us. That information is reserved for particular means through which God desires to reveal Himself; means that are not intrusive as one might expect or desire, but humble, gentle, quiet, and unassuming. Sort of like George Burns.
George Burns was, in my opinion, the best ever manefestation of God in a Hollywood movie.
I happen to think it is both wrong and misguided to look for God in apparent miracles, or to use apparent miracles as evidence of God.
The problem is, when you do this you shut down curiosity about natural processes, and wind up accusing those who debunk miracles as being anti-God.
Anyone who actually folllows science whether it be physics or biology, knows that natural processes are far too complex ever to be unraveled by humans. There is no danger of ever coming to the end of science, or ever completely cataloging the attributes of physical reality.