Unfortunately, you have fallen for the idea that, "oh, this time we can implement socialism better than ...".
Since no one can predict the future, the best quantifier for future behaviour is past behaviour. You have to admit that governments all over the west have a poor track record on social programs (see my post on this article for examples). It is just natural human behaviour (for good people with souls) to be optimistic and you are in good company; problem is, the people in charge are not any of these things.