that's the type of person to invite....

Basically that's the age you start becoming aware of injustice in society (assuming you ever do) - liberalism encourages you to work to fix the problem but of course many college liberals being young and immature also use liberalism as a club to either pump themselves up as being more moral than their classmates or to put their classmates down for not being as enlightened as they are (this is not unique to Liberalism of course; most strongly held philosophies are annoying when held by College students).

Rand and libertarianism give an alternate answer - "All that injustice in the world! It's not your fault. It's the fault of those lazy poor people and the government. In fact there is no real injustice, except the injustice down to well off achievers like you!" I don't have to explain why this message appeals.

Bryant