No, they don't - they try to reform capitalism to head off revolt against the capitalist status quo. That is why liberal reforms to capitalism (at best) only makes life better for a certain part of the working class - see how Roosevelt's GI Bill left black vets and their communities out in the cold for an example. When this fails to protect the capitalist order, liberal-types will happily co-operate with fascists to violently repress the working class - see Weimar Germany for an example of that.

If you are the reading type, I'd suggest Clara Mattei's The Capital Order: How Economists Invented Austerity and Paved the Way to Fascism - I haven't encountered anyone who explains the history as well as she does.

Liberals are not your friends - Malcolm X was perfectly accurate when he described them as "smiling foxes."