At the time I would say the majority of the international community believed there were WMDs and that Iraq posed a threat to its neighbors and the world. That was proven not to be the case. It was the biggest intelligence blunder that I can recall. I am not going to hold the POTUS at the time criminally responsible for acting on bad intelligence just as I am not going to hold our current POTUS responsible for drone strikes that take out top AQ leaders. Tough decisions have to be made when you are the POTUS and not all of them are going to be right or popular. If you could prove to me that Bush knowingly sent troops into Iraq after fabricating the intelligence that swayed us into going to war that would be an entirely different thing. I would be right there with you. Since you can't, I can't hold the man criminally responsible. He seems like a pretty decent guy. I am sure he deeply regrets certain things in his Presidency and this one likely is at the top of the list.
You may want to look up the literally hundreds of books that detail exactly what you're asking for.
The best one however, is called Fiasco.
It details how the Bush administration influenced the intelligence community to give him (president Bush) the answers he wanted. They were then looking for evidence that supported the idea that Saddam had WMDs. Rather than look for intell and then draw conclusions from what you gathered.
The mere fact that he had a bone to pick with Iraq was demonstrated in that inside his administration he was already discussing how to best take out Saddam even before 9/11. After he was done reading to the kiddos at the school, he asked whether or not Iraq was behind the 9/11 attacks. He clearly had a hang up with Iraq which began with his father's decision to not take Bagdad during the Persian Gulf war.
As far as "the majority" of the international community? Very debatable. France and Germany didn't believe that he did. However, Saddam wanted to be convincing that he did have WMDs. Why? Because look at his next door neighbor. As long as Iran thought he had them, they wouldn't mess with him.
See, Iran and Iraq aren't friends. Yes, they're Muslim. But Saddam and his government was Sunni and Iran is dominated by Shiites.
Of course, the Bush administration didn't really consider this. Especially the clown on top, because rather than read he relied on "gut instincts." And your everyday Joe Sixpack can't tell the difference between a Muslim or a Jew anyway. Who knew? Well, many in the academia world. But they were ignored or labeled liberal weenies who were with the terrorist. I had a professor at Uvu, a Vietnam vet, who was egged on campus while protesting the war with fellow professor and students.
Freedom fries!!! USA USA USA!
