I'm not sure we agree at all, Arthur except on incidentals.
You say you would support a mass anti-war movement but one that is critical of the politics of forces on the other side. Socialists should argue for and where possible try to create a mass movement to demand the immediate withdrawal of troops and to end the occupation now. There are all sorts of other things we argue including revolutionary socialism but we don't make participation in the antiwar movement conditional on everyone accepting them.
We should also support strikes against the war, blockades of armaments etc. support the right of resistamnce and the military defeat of 'our' government's troops and therefore support armed resistance to the US/UK (which is completely distinct from reactionary sectarian killings which don't resist imperialism but play into its hands). If we win workers to these ideas here then all the better but to either abstain or withdraw from the antiwar movement or set up our own much smaller rival is counter-productive and takes us away from any possible influence we may have.
From your comments you are clearly not in the AWL- they are completely absent from the antiwar movement which is a disgrace whatever criticisms one might have of the SWP.
However, your arguments still seem to make concessions to a confused/confusing position particualrly on the issue of Palestine/Israel.
On immigration controls and self-determination I think this in the context you use it is utterly reactionary. The Jewish population in Palestine/Israel of course should have democratic rights, just as much as the Arabs most of whom were expelled (or the children, grand children, great grand children etc of those expelled)either by force or fear of force in the 40s- why should these people not have the right of return? It is racist- one rule for one ethnic group, another for the oppressed nationality.
The Malvinas settlers were not demanding self-determination but to be part of the British empire and therefore part of imperialism- the irght of the British ruling class to control that corridor of the Atlantic and a springboard to resources in the area.