Germany, which maybe should know better than to use Hitler for any reason whatsoever and would do best to pretend like they never heard of the guy from here on out, hatched the baffling scheme to use the leader of the Nazi party in a safe-sex campaign. Do you have a moist boner yet? Why the hell not?
The commercial in question showed a couple in the midst of some sweaty coitus, and then, as the fellow lifts his head, we can see he's Hitler. He's Hitler, and he's unsafely log-jamming some poor lass into oblivion and apparently giving her AIDS in the process, because of course Hitler would do something like that; he's pretty much history's floppiest cock goblin. The commercial then tells us AIDS is a mass murderer, in case getting fucked by Hitler wasn't enough of a downer for you. It's like someone shitting in your lemonade: You take a sip without realizing, then you do realize, then the person tells you the shit was the result of your least-favorite food ever. Actually it's nothing like that. But, you have to admit, that would also suck.
"I prefer to hate my Nachos Bell Grande in solid form."
As you can imagine, this campaign was met with a healthy dose of abject horror, mostly from people who don't want you to liken a disease to humping a genocidal madman, which kind of puts a stigma on people who actually have AIDS by suggesting they're not so much victims of disease as architects of historical atrocities.