You're somehow even more off-base. Fascism is a result of Capitalism needing to defend itself through its own self-induced crises via violent means. There isn't a "choice" to make between liberalism and fascism, they are the same ideology justifting the same underling Mode of Production, finding itself in different circumstances. In other words, if the US is in prosperity, its ideology is seen as "liberal," if the US is in decay and responds to unrest with crackdowns, it is seen as "fascist," despite the same motive factors applying in both situations.
Capitalism isn't any easier or harder to defeat under the DNC or GOP, both are violent against worker organizing and have near-identical foreign policy (as is necessary to keep the Imperialist machine going). The DNC is not going to treat Socialists any nicer than the GOP, as the DNC and GOP are far closer together than the DNC is to Socialists.
I highly recommend you read Blackshirts and Reds, at least the first chapter as it goes over fascism (though the whole book is great).