People typically argue against the existence of time travel because of the absence of time travelers from the future, but this doesn't account for the idea that any responsible time traveler would probably wish to avoid destroying themselves through the butterfly effect and all by showing up before they were born — either that or they would cease to be after making a single impact on a scale large enough to cause the circumstances of their birth different, and they would never have appeared at all at that point. (Which is likely as simple as taking a time machine to a location or taking a single breath)
Am I just looking at this in a retarded way of that everyone's thought of before but moved on from? If so, what's the next step in my thought process?