Squard stabbed Whitebeard, and instead of Whitebeard beating him to a pulp, he hugged him and forgave him on the spot....... He also brought Ace on his ship knowing the man was trying to take his life, and allowed him to try and do so day in and day out. Blackbeard looked up to Whitebeard and was with him since he was a child. Where do you think Blackbeard learned those principles he was preaching on Jaya?
So what makes you think Whitebeard wouldn't react in that similar manner if he was pitted in a similar situation?