The male protagonist sees the video screen and does not try to destroy the dress first, what will happen to the video screen

My sister took a video camera to record their experiment, and the camera was dazzling (maybe because I played it at double speed). The geeks make the time machine very happy. It's really worrying if they see their time and space distorted when they wear it.
The discovery of the current self on the 7th birthday video shows that time can be predicted. Then why not directly show the scene where the male protagonist destroys the time machine in the ending and discovers them in real-time video?
The male protagonist sees the video screen and does not try to ruin the dress first, what happens to the video screen.
The male protagonist found that the butterfly effect brought by the time machine was very serious and unclear, so he directly decided to destroy it from the beginning. The butterfly effect also includes the good side, but the bad effect is easier to be discovered first. Watching his father die, the male protagonist can do it too. Is it really good to just ruin the time machine without leaving a way out?
Like the ending, even after seeing the video lessons left at the beginning, the time machine is still exciting.

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