Ask Lemmygrad

Those who control the commanding heights of industry have a powerful hold on the foundations of society, and this has cascading impacts on the rest of society. The state is also not outside and above the realm of production and distribution, but thoroughly enmeshed within it, and therefore must be the representative of the ruling class. Socialism allows the working people to determine the direction society heads in, and direct the social surplus as they see fit, rather than be appropriated by private parties.

That's extremely simplified, perhaps overly so, but this is generally where I start.