Beam Clash or Beam Struggle is a very popular `battle` in Japanese comics and animation. It usually occurs when one side launches a powerful beam of energy at the opponent, and the other side also responds with a blow.
There is a famous meme about Beam Clash that `the right side will always win`.
It is easy to see that in most cases, the `good guy` side will have a higher chance of winning.
A hypothesis is based on the theater culture with a rich and long history in the land of cherry blossoms.
One of them is the distinction between `Uwate` and `Shitate`.
Image explaining Uwate and Shitate in theater arts.
There is also a custom in stage plays where the protagonist enters from the `Uwate` side (right), and the antagonist enters from the `Shitate` side (left).
As for why people tend to think that `the right side is more positive`, famous Japanese animation director and creator of the hit Mobile Suit Gundam series, Yoshiyuki Tomino, thinks it’s because
Another similar explanation lies in the order of reading Japanese comics from right to left.
In short, the joke `common sense always wins` in Beam Clash matches probably started from Japanese theater culture and comic book reading order.