Iraq was attacked because Washington had had more than enough of Saddam and his antics.
Every time Saddam moved his military to Iraq's borders, threatening war/invasions...US had to react and defend his targets.
The US, note...not China, Russia etc.
Now we have China, threatening to attack Taiwan...testing Biden.
The only way to save Taiwan, ...once it invades Taiwan,
Australia will likely be next.
The only way to stop China is for the whole world to gang up on it.
US cannot, and should not be expected to, defeat China on its own.