If I'm not mistaken you are of Korean heritage. You do realize that if the US hadn't intervened in Korea in the 50's your family would be living under the thumb of that despot Kim and likely you wouldn't be here on earth.
I've already addressed this argument. See above.
You were too young to know some of the reasons we invaded. But I will give you a few.
Can nobody know the reasons for any war other than those they saw as adults? Then we're all too young to know the reasons for any war other than a tiny sampling that happened to occur in recent decades. Obviously, that's not how it works. You can know why Hitler invaded Poland as well as a German who happened to be a middle-aged Berliner back when it happened -- possibly better, since you will have learned about it after the history had been digested and much of the behind-the-scenes action had come out, whereas he will be burdened by having learned about it first through the lens of Nazi administration propaganda. The same is true for a non-elderly person commenting on Bush's desire to start a war on Iraq.
1. Saddam had the worlds intelligence agencies convinced that he possessed WMD's in fact that is one of the reasons Iran didn't attack him after the Iraq/Iran cease fire.
Many weren't convinced, which is why the US couldn't even line up some of its closest allies, like Germany and France, behind its war-mongering attempt to get a UN resolution. They, sanely, wanted to give inspectors more time to learn the truth. Bush, on the other hand, became increasingly impatient the more evidence came out undermining the case against Iraq (e.g., the lies about Niger uranium, the supposed al Qaeda/Iraq meeting, and all those sites our sources insisted were WMD sites but inspectors confirmed weren't). Bush saw the case for war rapidly unraveling as more intelligence came in, so he rushed us into attacking without even holding the vote he'd promised to hold in the UN.
2. Saddam indirectly supported world terrorism by giving large rewards to the families of dead terrorists.
Overall, Hussein was a bulwark against terrorism, as a secular leader imposing order in an area otherwise likely to devolve into a playground for both Shiite extremists and Sunni groups like al Qaeda and ISIS. Everyone who understood security policy warned that taking down Hussein would bolster such terrorists, but right-wingers, who understand nothing about security policy, were sure they were wrong. Now we all know who got it right.
3. Saddam brutalized his own people even gassing the Kurds for opposing him.
Yes. And the same can be said for the leaders of about three dozen nations at any given time -- brutal dictators are a dime a dozen. That's not treated as a reason to conquer the country unless we see resources to seize and want to use a fake humanitarian concern to try to fool a handful of soft-headed bleeding hearts to move into the warmonger camp.
The invasion and war were cake walks in the overall scheme of things
It was a multi-trillion-dollar error that we'll be paying for generations to come.
and we were treated as hero's at first.
There are always some who wave the flags for an invader, if only to curry favor. But in the end, a significant chunk of the population was willing to face near certain death in facing our vastly superior force, because they saw us as a hostile occupier -- an outcome that those who understood security issues correctly foresaw and noisily warned of, but that the "cake walk twits" on the right had stupidly dismissed when they were told it was going to happen. That's why none of the informed people take them seriously. They're consistently wrong about everything.
Wrong! the ME is important for the vital shipping lanes that support the world economy.
Protecting those shipping lanes didn't require trying to install a fresh puppet in Iraq. In fact, threats to our shipping have actually been made worse when idiotic right-wingers engage in their usual geopolitical incompetence -- for example, the USS Stark was attacked "accidentally" after Hussein found out that the US (his nominal ally) had been secretly arming his arch-enemies, the Iranians. As always, the wingnuts thought they were playing such a clever Realpolitik game, and as always, it blew up horribly in America's face.
It is hard to have a clear perspective when you wear blinders that only allow you to see things one way.
Agreed. But this far into your dotage, it's hard to imagine your perspective will widen at all.