I can certainly provide evidence that for over 30 years the pleas of constitutional nationalists fell on deaf ears.
And of course the only ears they could plea to were British ones, so how is it racist to point out that the British government let us down so badly we took up guns?
You said;
"... no British person ever stood up and protested about the filthy apartheid regime being propped up by Westminster."
I do not know where you come from, but in Britain most governments do not even claim a 100% approval of the electorate. Your statement is equivalent to saying that all Irish supported terrorism because the UFF were Irish. Or all jews are responsible for the actions of the Israeli government.
Quoting from the troops out movement;
"There is a long and honourable tradition in Britain of opposition to the occupation of Ireland. It goes as far back as 1647 when one of the first political parties in England and early socialists, the Levellers, published The English Soldiers' Standard in which they set out their belief that Ireland should be free.
Two years later, in 1649, a group of English soldiers, inspired by the Levellers, mutinied rather than go with Oliver Cromwell and his army and take part in the slaughter of Irish people. In their own pamphlet, The Soldiers' Demand, the group asked "What have we to do in Ireland, to fight and murder a people and a nation... which have done us no harm? We have waded too far in that crimson stream already of innocent and Christian blood."
Their defiance was costly. Pursued by Cromwell, the insurgents took shelter in Burford Church in Oxfordshire before being surrounded by his men. Their leaders were hauled out of the church and executed on the spot. Corporal Perkins, Private Church and Cornet Thompson are still commemorated each year at the very place where they were murdered by the Crown.
Opposition within Britain continued to ebb and flow through the succeeding centuries with, for example, strong support for the Fenian Movement in the north of England in the 1860s, through to the Home Rule Confederation of Great Britain in the 1870s and the Irish Volunteer Movement in 1913 (of which Michael Collins was a member during his time in London).
After the 1916 Rising came the Irish Self-Determination League which numbered something like 40,000 members. And when Terence Macswiney died in Brixton Prison on 25 October 1920, tens of thousands lined the streets as his coffin passed by.
When the conflict in the north erupted in the late 1960s, the Irish Civil Rights Solidarity Campaign was formed, quickly followed by the Anti-Internment League.
This organised opposition to Britain's presence in Ireland continues to this day through, for example, the Trade Union Movement, a small but dedicated number of MPs, and groups such as the Wolfe Tone Society and the Connolly Association. The backbone of the various resistance groupings has generally consisted of first and second generation Irish people, but there has always been a small stream of English radicals, and people of other ethnic backgrounds, ready to take up the cause of Ireland.
By September 1973 some British left-wing radicals, trade unionists, Irish people living in Britain and many other ordinary people had managed to see something of the truth of what was happening in the North of Ireland through the fog of British Government propaganda.
They were appalled at what they were seeing and they came together in London to form the Troops Out Movement.
They were tapping into an almost unbroken tradition of resistance within Britain to the state's involvement in Ireland. In 1974 there was sufficient support for the group to be launched nationally, with branches throughout Britain."
I think you need to face the fact that your views about British people may be a little prejudiced. There is huge diversity in Britain, in ethnicity, politics, religion. It is wrong to say that Brits believe this or do that.