Communism in the 20th Century became strongly associated with brutal totalitarian dictatorships in the Soviet Union, China, Cubar, Eastern Europe and elsewhere. To their credit, Labour never attempted to impose a dictatorship in Britain and when they were turned out by the electorate they peacefully surrendered power to the Tories. Socialists in other West European countries were similarly peaceful, but I'm hard pressed to think of other examples outside the region.
Laski was taking the very long view, and didn’t demand the “dictatorship of the proletariat” right away. He knew that every step to the left, every “program” that was instituted, would never be repealed even if the socialists were temporarily turned out of office. Look at the National Health Service; that has irrevocably turned Britain into a “worker’s paradise.” It has not been repealed, there is no serious talk of ever dismantling the program.
It is very much the same here with 0bamacare. It will be tweaked around the edges a bit here and there, but in the end neither party really wants it gone, and so it will stay. No matter how toxic it is to the economy.