Here is the thing: anyone who is not thinking practically in terms of the logistics required to accomplish specific, desirable outcomes, is between useless–and more often–damaging.
Most of us can likely agree that global peace and prosperity are desirable goals, but anyone who is proposing means without evaluating if those are likely to be effective means, anyone who thinks that merely having a goal constitutes morality, is being self indulgent. It is narcissism, infantilism. It betrays a lack of moral and emotional maturity.
And with regard to Leftism, even a casual student of its history knows that it is crooked and rotten at its core. It is IN PRINCIPLE a rejection of the common sense morality and decency that makes it possible for human beings to live happily in harmony with one another, as I have repeatedly argued at length, particularly on my other website.