>>86383944It's because cancer is played out and we've more solved AIDS in that with the right treatment, HIV can be kept in stasis forever and will never progress to full-blown AIDS. So they need to pick something that's still incurable today to use as a cause to care about.
The problem with using vitiligo is afaik, it has never killed a single person. It doesn't do anything lifethreatening, it just causes your skin to turn pale in patches and so you have to wear more sunscreen. Which yeah sucks, but you'll live.