Why human need space and time travel?

When it comes to  time travel,the question arises WHAT IS THE NEED?
Well it is hard to believe that our future depends a lot on time travel.
HOW?
Here is the explanation.
TIME TRAVEL
Our present is plagued by many problems like climate change,global warming,terrorism,civil uproars etc.We really need some serious and decisive solutions to these big and never ending problems.HOW we can bring these escalating problems to a halt?
There seems no solution.In present,due to huge differences between people,communities and nations,a well working solution is not possible.BUT now think about time travel.A damn large number of problems could be halted by altering the past and many problems of future could be diverted by visiting future.
Look how our problems would be extinct in a matter of past.
But there is a dark side too.Time travel can also become the biggest threat to mankind.If past is even altered at micro level it could change the present significantly.
Some nations can use to fill their aspirations and everything can go wrong.Personal aspirations can also lead to disaster.Even future travel can also yield many problems.

I GIVE A  SIMPLE EXAMPLE TO SHOW ITS DEMERITS.
Imagine HITLER is alerted about future comings.Then rest would have been a dark past in our present.
Well the debate whether the time travel would prove to be a blessing or a curse will continue till and after the first time travel is achieved