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50px-Purple_exclamation_mark.svg.png This answer is opinion-based.
Due to lack of canonical information in the franchise, there is no definite answer to this question.

Because it's a common occurrence when one has an advantage over a large group of people and is already in the mindset of being better than everyone else. Shen found advantageous power in his firework cannons and believed (as blood heir to the Gongmen City throne) he deserved to rule.