He has done what he has been itching to do for some time, and that is have his own war. Given his dropping popularity and troubles at home, he has done what American president have frequently done in such situations and that is attack a smaller country, which tends to rally the jingoists, of whom there are many in this country, around the president. These people do not care about international law or committing war crimes.
This attack should be roundly and instantly condemned by everyone.
