The absence of time travelers from the future is not a definitive proof that time travel is impossible. While it is an intriguing observation, it does not provide conclusive evidence against the possibility of time travel. There are several reasons why no one from the future has appeared in our time:
Time travel might not be technologically feasible yet: It is possible that future civilizations or individuals have not yet developed the technology or understanding required for practical time travel. Just because it has not happened yet does not necessarily mean it will never happen.
Limitations or restrictions on time travel: It is conceivable that if time travel is achievable, there may be limitations or constraints that prevent travelers from visiting certain periods or interacting with the past. These limitations could be physical, technological, or even governed by some sort of temporal ethics or regulations.
Avoidance of interference: It is also plausible that time travelers, if they exist, are intentionally avoiding interference with the past to prevent potential negative consequences or disruptions to the timeline. They might be adhering to a principle similar to the "observer effect" in physics, where observation itself can alter the phenomenon being observed.
Preservation of the timeline: Time travel might be governed by strict rules or laws that ensure the preservation of the timeline or prevent paradoxes. If time travelers are operating within such constraints, they might be taking measures to avoid altering events in the past or to maintain the consistency of the timeline.
It is worth noting that time travel is still a subject of scientific exploration and debate. Various theories, such as wormholes, time dilation, and exotic matter, have been proposed within the realm of theoretical physics. However, the question of whether these theories can be practically realized remains unanswered.
Ultimately, the absence of time travelers from the future does not definitively prove or disprove the possibility of time travel. It is an intriguing observation, but the limitations and complexities of time travel, if achievable, could provide explanations for why we have not encountered visitors from the future.