I'll be the first to admit that this isn't my cup of tea so to speak. The design is clever and visually appealing and I'm sure a lot of Apple users will find it attractive and enjoyable.
As a pasty white guy I don't understand the righteous indignation of some people over a watch band and wallpaper.
If you don't like it, don't use it and move on. No one is forcing it on to your device. No one is making you support "black unity". So shrug your shoulders, mutter "meh" and move on with your life.
If it neither picks my pocket nor breaks my leg..
I'm not inclined to pour so much energy and attention into something that has no effect on my life unless I pour more energy and attention into it. There are plenty of "insert cause here" awareness months in the year. I ignore most, if not all of them. I'm busy living life and really don't have the time or energy to to be triggered.
If you don't like it, don't download it. Don't buy the watch band, and don't participate. No one is FORCING the black unity wallpaper on you. No one is making you buy the band.