know

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The President Assad-supporter should have known better than to dedicate a song to the reportedly hated-by-millions Syrian leader!
Perhaps Hussain should have known better than to voice his political opinions in public, especially that a group of anti-Assad activists protested against him ahead of his arrival to the German capital.
Included in the legislation is a "should have known" standard, which is similar to parents telling their children that they should have known better than to do something.