You have a very skewed view in my humble opinion. before GW1 Saddam and his government were warned by James Baker the US Secretary of State, through the UN that any use of WMDs would provoke a massive overwhelming response that would destroy Iraq. Remember during the Iran Iraq war that chemical weapons had been deployed and used, just as in Halylabja with the use of blister and nerve agents. So the history was there.
There is already president for the arrest of ex heads of state within the UK. Ordered by the UK courts on a warrant from Spain and supported by Straw. Found to be unfit to plead.
Pinochet arrested in London | World news | theguardian.com
The arrest of Augusto Pinochet: ten years on | openDemocracy
Tipi Livni, the Israeli Foreign Affairs minister did not come to the UK after it was put that she could be arrested despite diplomatic immunity.
Rendition, you have not answered the question, if one of your family was rendered to the US, would you scream and shout or stay silent. Why in your view have we not taken action against the NK regime.