Being "less" self absorbed means you would prefer people to think more about others than themselves. This puts YOU into the Marxist/collectivist camp whereby you are forced to be your brothers keeper... even at the point of a government gun.
No thanks.
Let's not get stuck on the semnatics of self abosrbed ---As I see it---libertarianism violates a principle rule of politics going back to the origins of Western civilization and that is that all parties - individuals, groups, nations - will pursue ends that are disastrous by their own standards if they are not checked in some meaningful way. Of course along the way representative democracies may become corrupted by an entrenched political machine for example the Dems...and that corruption can be broken...but the principle at work here is the unity of society...not the individual.
The problem with Libertarianism and communism and islam is that they enforce abstractions and utopias...dangerous minefields for humanity as we have seen.