I don't know about the one in Denver but the same could be said for the Vegas shooting and other school shootings or even black communities. It happens.
Regardless, LGBTQ have parades annually in almost every city for decades and many other events. If they were being persecuted they would be beaten in the streets or worse. They are not but again, believe what you want. If you believe it then that is your right. I do not believe they are being persecuted like the Cajuns were in Canada or blacks in MS back during the MS Burning Days. That's not what is going on.