Typically socialists blame their failures on one or a combination of things:
1) That failure was not failure. It is a huge success that its detractors are blind to.
2) That it was underfunded. Socialist programs are notoriously greedy for ever increasing resources. And when they cannot get ever more resources, they cut back on performance “to save money”, so theoretically eventually they would get ALL the resources and do nothing in return.
3) It has been sabotaged from within by those opposed to it. The Russians were big believers in shooting people they suspected of sabotage of things far beyond their control, like the weather.
4) Socialist systems cannot work in competition with any other system. It must be universal to work. And if it is universal, and is still a total failure, use the other excuses.
And ...?? Is there some new info there you imagine I do not allready know?