Hereditary entrance into politics is not justified to the point of hilarity. This would allow the stagnation of policies and practices and the entrance of politicians who are possibly even more inept and ignorant then those we have currently. This would be a policy contrived by a sea of politicians who feel themselves as important as a king or queen who are in reality just a pool of fools getting paid to suck the life out of the people they are meant to serve.
Political entrance into the political arena because of the connection to a family member is not the proper way to get into government service. However, that is the way that most political members get connected and that is by family networking. The Kennedy's is a famous example of hereditary entrance.