They have to say it in a diplomatic manner, but thats not unusual. Look at the CIA scandal. CIA wiretapping Merkels phone. German politicians are outraged, but what they actually say sounds quite harmless.
When Gauck visited Israel he said that germany is on Israels side and he hopes for a peaceful two-states solution(Israel and Palestine exiting next to each other, peaceful and set borders) and he hopes that armed conflict with Iran can be avoided.
Thereby suggesting that Isreal is interested in a peaceful two-state solution and avoiding war with Iran.
Some people where outraged by that. But nobody could really argue against it. I mean, how could you?