How would the expropriation of the bourgeoisie go pacifically? I don't think anyone prefers a violent revolution; revolutionaries just recognize the unfortunate necessity of violence.
I know some self-proclaimed democratic socialists. Needless do say that this is just an excuse to surrender to parliament and abandon revolution (ie, renounce anti-capitalism, becoming reformists at best).
I'd say that it's not even idealism, it's naive.
EDIT: Just realized that maybe there was no discussion intended itt?