Why do most philosophers insist that ethical principles should be universal?

Why do most philosophers insist that ethical principles should be universal?

Why do most philosophers insist that ethical principles should be universal? Can't I have my own private ethical code, my own set of principles, which I don't expect anyone else to follow, although I would not be against the fact that others follow it, that is, I'm not trying to be a free-rider or harm anyone. One of my principles might be: don't preach.

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