That is the real means to change society, through its institutions, or creating new ones (unions, interest groups, etc) that can challenge the existing institut

That is the real means to change society, through its institutions, or creating new ones (unions, interest groups, etc) that can challenge the existing institutions. Killing a rich man won't do much, especially if he has a will. The point of interest is the system that creates a strong power law distribution in the first place.