Libya and Waco

So US thinks that it should bomb countries that use force against the citizens. How would our people have reacted if other countries decided to drop bombs on us after Waco or Ruby Ridge? I also heard that Obama is saying that he did not need to consult with congress before taking the action because it is not was as there is no ground invasion. If a ground invasion is what makes it war, did the 9/11 hijackers not launch a war with running plans into the twin towers or did the Japanese not start war with the bombing of Pearl Harbor?