Power, they wish to conserve any power they can for themselves and their in-group at all costs to maintain the order of using the government to privilege nepotistic wealth concentrated to as few individuals as possible at the top of a socioeconomic hierarchy.

Historically though, before the Trump cult and the reactionary neoconservatives, conservatism was to preserve the authority of hierarchies under traditionalism and started around the time of the French and American revolutions.