...because the first thing warlords do when they take over Scottsdale, Arizona, is invest great amounts of money in technology to revive old people, then use their highly advanced mind-controlling powers to turn them into mentally aware but vicariously controlled slaves, or otherwise coerce their few dozens of old computer scientists and physicists to kick babies and spit on puppies. Because warlords and UnFriendly AIs are evil for the sake of being evil. Makes perfect sense.

(Your parenthetical point is an argument for donating to FAI research, not an argument against getting froze.)