Imagine that your family name is kindof-well known, people generally are aware of its existence, and your parents are generally known as being successful (even if they are perhaps controversial). It's safe to say that politicians rarely crop up apropos of nothing, so they usually grind out some kind of business or networking thing before they start their big bid and have a strong network once they do launch.
Imagine knowing that your folks tend to juggle a lot of responsibilities and decision-making, even if they don't do so perfectly. Your name is associated with all the good (and bad) being done by your folks, and generally the braincages on your family name are highly desired for what they think and decide. People want to influence and sway them, people depend on them, people have real and visceral emotional responses to the stances they take and the things they do.
Imagine that they've managed to somehow provide for you as well, and have placed a significant amount of expectations on you to follow in their footsteps - not as politicians, but as a successful person who contributes to their society. Imagine they pay for your private schooling and private tutors, use their connections to secure you access to influencers and decision-makers at elite institutions, and set you up with everything a person could ever want to succeed and lead a happy, meaningful, fulfilling life.
And lastly, imagine that you're a lazy fuckup narcissist.
Seems to explain like, 101% of the cases.