Greetings from the past!

You could just as easily say that Down syndrome is a perfectly normal phenomenon.

Until it directly affects you, it's none of your business.
Don't confuse orientation with idiocy.
Many people come out with posters at "parades." Some call it a rally, others a parade, and still others an exhibition.

The point is not this.

Medicine has proven that it is not a disease, not a deviation, not a pathology.
Orientation is not a physical property.

And also! Most importantly, orientation is not about who you "have sex with," but who you "love."
And don't mix your dirty imagination with objective reality.

Love is always beautiful, and it doesn't matter who loves whom more. Parents love their children, children love their grandparents, or a boy loves a boy.