Lifetime appointments just mean they get to force THEIR politics on the rest of us, instead of being accountable to ours. It doesn't make them magically apolitical. They are partisan hacks appointed by shitty legislators elected by an antiquated electoral system participated in by a disenchanted and uneducated mass. The Supreme Court doesn't have a great track record of being some sort of enlightened wise guru above the fray, they're very much a part of the broken model of American representative democracy and its inability to cope with the issues of modernity.
(sorry, new account BTW, lost the last password)