That assumes that "socialists" are really trying to do this and not simply 1) jealous of those with more and 2) simply trying to replace who's in power - with them at the helm.
Why socialism? 70+ years ago? why not. Today? why not socialism? 100+ years of history of the abject failures on every level of every promise and the hell on earth socialism creates.
For every promise of moving past the "predatory phase of humanity" that socialism makes... it breaks and does so in worse ways than capitalism.
Imperfect capitalism has proven better than imperfect socialism at every level of analysis. IE, from the article:
"Private capital tends to become concentrated in few hands"
Inequality exists with capitalists? Guess what? No socialism structure shows that inequality ends with socialism - the inequality remains.
But... we can watch someone like Bernie talk about how evil capitalism is as he flys between his 3 houses, with all his super cars and buy seats to his shows and all his books. You can read all about it and talk about it on your iPhone at Starbucks drinking a latte.