to my understanding the liberal democracy ideology has existed as and ethical statement in a capitalist society in other words the liberal democratic ideology complements the capitalist one. take the right as an example it has (in American politics) use conspiracy theories to promote a reactionary emotional way of thinking that blocks rational thinking and also commonly promote the interests of the bourgeoisie class which go against standard ethics as such being a leftist individual just comes a standard way of thinking.
catachresis wrote
I like to think most people are leftists because they care about other people and don't want to see unnecessary suffering.