I don't think we can build a machine to make time travel possible. If we can get back in time and correct the mistakes made by someone who has a negative or negative impact on millions of people, we will definitely try to do it.
But each action has an equal and opposite reaction. A change in the past will create a series of events that will create many other sub-chains and sub-events. Ultimately, this raises the entropy of the world to be an unmanageable disaster.
Such a beautiful example can be seen in the "butterfly effect" film. In this film, the hero tries to change past events, but his efforts create more complexity for the people he wants to change. As a result, he realized that his beloved people were responsible for everything he suffered. And then he kills himself before he's born.
Therefore, killing Hitler's baby may have many negative effects on the overall well-being of human life. An event can lead to more adverse effects. That's why there's no way to kill him in infancy.
