Because they rely upon government for survival. It's all about indentured constituency.
WINNAH!
We have a winner! The entire strategy of the Democratic Party since 1932, summed up in two sentences.
And remember, it came from a Knickerbocker patroon, who knew something about indentures and Old World squirearchical feudalism.
Knickerbocker patroon??
Ahem, given the ambiguous antecedent for "it" and that my surname is Dutch, I assume you are talking about Mr. Roosevelt, as none of my family has ever settled in Noo Yoahk.
Still, the Marxist gambit in the US is considerably older than 1932 as is evidenced by the political seed bed having been worked for decades by Messrs Mann and Dewey. Further, said patron's progenitor-somewhat-removed-by-the-same-name had (under the guise of Republicanism) built the debt that brought in the Fed feeding constituent military contractors and instituted socialized risk management (protecting the poor babies) with uncompensated regulatory takings, all in the name of patriotism!