Abbas‘ comparison of Israel to Nazis is prevalent sentiment in today’s Germany – Opinion: Palestinian president’s comments, claiming Israel is responsible for ’50 Holocausts,‘ were made without concern of retribution because he wasn’t the one who thought of the idea, he merely repeated it | ynetnews

You’d have to be quite bold, if not crazy, accept an official invitation to Berlin, to meet with the German chancellor and while there, claim that Israel had carried out „50 Holocausts“ against the Palestinian people.
At first glance, it could be perceived as some sort of madness. Even if Palestinian President Mahmoud Abbas is known to dibble in Holocaust denying, he should have known that some things must never be uttered out loud on German soil.