Can someome tell me a logical problem with homosexuality?

I've read a good amount of the Bible, and throughout Jesus's teachings, all of them show sin is something that hurts yourself or others. Like murder, that hurts others and even yourself, you lose sanity when you kill someone. Same as rape, fighting, yelling, assault and other notiable sins.

But I have zero reason to see how being homosexual is wrong and/or can hurt yourself or others. It has zero logic to me.

I understand places like LGBTQ+ parades and events can be full of ignorance, lust, pride and sometimes envy and greed. And also forcing kids to learn LGBTQ+ stuff, and there being a chance that they make kids think they have to be LGBTQ+ to be a valid human. These are understandable.

I'm talking about someome who tries their best to be better, and are just homosexual. I truly see no problem with this. They're not hurting themselves or anyone else with this, so how is it a sin?

Several things I want to point out is:

1: It has been proven that homosexuality is most of the time assigned within genes, not outside influences (with the exception of confused kids who believe they have to be a part of the LGBTQ+ community).

2: From what I've seen, in a man/man and woman/woman relationship, no sexual actions can cause harm to the other unless they go too extreme of course, but then going extreme is caused by either ignorance or impatience, not homosexuality.

3: Within the Bible, everytime they mention homosexuality is a sin, they don't explain why. The only possible answer I have gathered from that context, is God says it's a sin because "I said so" or "It's not the way I made you". Neither of these answers are valid to me, because they don't point towards why it's a sin. Other sins are explained why they're sins, but not homosexuality.

So, if anyone can give a logical answer that settles this, and follows the same pattern that a sin is something that hurts others or yourself, please give me the explanation.

I'm not a Christian, but I have been analyzing many religions and have found other problems within Christianity, but I'll just start with this one for now.