If you understand the problem and don't believe it matters then I have nothing else to add. I respect your choice of belief.
Otherwise: light pollution disrupts wildlife, impacts human health, wastes money and energy, contributes to climate change, and blocks our view of the universe - this last one being something humanity has enjoyed for thousands of years.
It's possible these are not topics that concern you - that is entirely your option - but it does concern other humans who quite enjoy the night sky and would love to pass it onto the next generations better than it is now.
If you'd like to know more, here's some good resources: https://www.darksky.org/ https://www.darkskiesmatter.org.uk/
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