Why Socialism keeps coming back

Socialism and its economic theories have been roundly defeated but it persists and returns periodically because it has never been challenged on the only grounds it can be defeated, namely moral grounds. The conservative right cannot mount a moral assault on socialism because it shares the same philosophical roots of  Christianity with its,self sacrifice and brother's keeper altruism.
Hence the tediously predictable alternation of Conservative,Labour,Conservative,Labour governments over the decades.

Only a political movement divested of this religiously rooted philosophical impediment can defeat the toxic virus of socialism and its fraudulent  moral claims.