Cus they're all liberals. Liberalism is the philosophy behind the economic mode that is capitalism. There are progressive, moderate, conservative liberals, just as there are progressive, moderate, conservative socialists. Fascism is also just more liberalism
Liberal goals align with those of fascists and fundamentally oppose those of socialists because both fascists and liberals share the goal of maintaining capitalism as the mode of production. With this necessarily comes support for the things that capitalism requires to function: exploitation, dispossession, imperialism, social murder, genocide, war, &c.