More About it

So I watched some more of Stephen Hawking's into the universe and he explains some very interesting topics on time travel. First of all, many of the methods that he explains concerning time travel he says have a very low chance of actually being capable of invention. However, he does believe that on method of time travel is possible. This form of time travel only consists of future time travel and consists of traveling the speed of light.
Scientists and Physicists believe that one of nature's laws is that nothing (except light) is allowed to travel the speed of light. If man built an object capable of moving something the speed of light (which in a way we have), then nature itself will slow time down in that machine. Therefore, if people were on board a train capable of traveling the speed of light, time for them would be slowed down and everything outside of the train around them would be traveling faster. Therefore, while the people inside this incredibly fast train may only feel like they have gone through a week in time, everything around them may have aged by a hundred years. Therefore they have traveled into the future in a way.
Therefore, this process does not require some special and incredibly complex device that goes into a parallel universe or any sort of jargon like that, but instead is sort of nature's own time travel into the future. Because this only goes into the future, I do not believe time travel such as this would be irresponsible and ignorant.