Taking away the materials from our time to the future is mostly a big loss for the global economy (the cheap ones are also in the future cheap). It can cause big oppositions and the fall of a elite or agency.
If you get involved in conflicts here, other agencies can start spy on them, which can cause a war/conflict in the future.
So if the future is here, maybe they only come for what is very expensive in their time and very cheap like waste in our time.
Imagine like that farther future can say: “That where my ancestors.”. Also that can start a conflict and the farther future is much stronger we assume.
Maybe they did came to understand things like the pyramids, but much more information te reveal from the past don’t exist.
Alexx Blog 
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