I don’t think Dumbledore does shit for no reason. I think he knows more than he can let on, so he acts on what he knows but doesn’t provide the real justification because it would compromise his sources and methods. He probably has extensive access to prophecies, which are the only way we know about that information can travel back more than 6 hours. Dumbledore has done some very long range things, like “your father’s rock”, and the hint to Lily about thestral blood. This is a guy who has access to many more relevant prophecies than we have seen. He at least has bugged Trelawney’s bedside, and he may have sorted out better access than that. Plus, by being someone who is very powerful and extensively engages with, interprets, and acts upon prophecy, he becomes a relevant actor that prophecies tend to come to. Dumbledore is an excellent tool for prophecy, and vice versa.
I don’t think Dumbledore does shit for no reason. I think he knows more than he can let on, so he acts on what he knows but doesn’t provide the real justification because it would compromise his sources and methods. He probably has extensive access to prophecies, which are the only way we know about that information can travel back more than 6 hours. Dumbledore has done some very long range things, like “your father’s rock”, and the hint to Lily about thestral blood. This is a guy who has access to many more relevant prophecies than we have seen. He at least has bugged Trelawney’s bedside, and he may have sorted out better access than that. Plus, by being someone who is very powerful and extensively engages with, interprets, and acts upon prophecy, he becomes a relevant actor that prophecies tend to come to. Dumbledore is an excellent tool for prophecy, and vice versa.