How costly were these Post WW2 military mistakes

[OSR stands with Israel]

Korean War: MacArthur tells that China is next after North Korea

How costly: Causes China to intervene which stops the UN from able to make the entire Korean peninsula anti communist

Vietnam War: US doenst invade North Vietnam after stopping the  Tet offensive

How costly: Could have ended the war in 1968 instead of 1973
 
Iran Iraq War: Saddam tries to win the war through attrition rather then use Blitzkrieg early  in the war to win

How costly: Causes 7 years more of war which ended in a stalemate instead of ending with a Decisive Iraqi victory in 1981 or 1982

Soviet War in Afghanistan: Not sending more troops to pacify the place after their invasion

How costly: No difference

Afghanistan War: Not pursuing Osama Bin Ladin and the tailban at tora bora letting them escape to Pakistan

How costly: Lets the Tailban and terrorists regroup and form an insurgency by 2005-2006, and Osama remains alive until 2011

Iraq War: Disbanding Iraq military

How costly: Destabilizes Iraq which forces US troops stay to pacify the place instead of able to leave Iraq by 2004 or 2005, and lead to the rise of ISIS

[OSR stands with Israel]

I think disbanding the Iraqi military and civil service was one of the worst decisions ever made by any US president. The west well and truly threw out the baby with the Ba'ath water.

Now many of former Suddam Huusain's Republican Gaurd are part of ISIS so they can take back power they fell was lost after the US disbanded their Army

[OSR stands with Israel]

But doesn't that poke a hole in the dominant Republican theory that it was really Obama that destabilized the Iraq when he lost the invasion in 2003?

For destablizing it does poke a hole in the Republican's theory but Obama did fail to react when ISIS invaded Fallujah in December of 2013 and if he started the air campaign then and their ISIS would have been stopped in their tracks. Now only ground troops have to come to stop it, and if they do  it probably wont because troops will occupy the land for ten years instead of just quickly defeating their enemy and leaving.

For the ISIS sitution I blame

50% on Bush/Cheny/Bremer- For disbanding Iraq Military which destabilized Iraq
40% on Maliki-  For not letting Sunni's participate in the government
10 % on Obama- For not keeping air cover for Iraq when they left in 2011

[OSR stands with Israel]

I think disbanding the Iraqi military and civil service was one of the worst decisions ever made by any US president. The west well and truly threw out the baby with the Ba'ath water.

We prefer Wahabbi jihadists to relatively secular Ba'athists. Just look at Syria.

Or Saudi Arabia

[OSR stands with Israel]

Vietnam War: US doenst invade North Vietnam after stopping the  Tet offensive

How costly: Could have ended the war in 1968 instead of 1973

No it wouldn't. Unless it ends because of a mushroom cloud.

US invading North Korea didnt cause a mushroom cloud. All this does is puts pressure on the North Vietnamese when they are weak which forces them to agree to a cease fire in 1968 instead of 1973.