Also it's not like the Israelis have only a few crews and a bunch of tanks for them to jump out of and run back to get in and drive to the front. They mobilize all they can handle, Merkavas or Sabras or whatever; the point the Israelis consider is that their total population is less than 9 million and individual lives are very important culturally. So like the Americans, they do a lot to protect their troops, tankers or infantry or whatever. The idea of protecting the crew comes from that point of view, not "they can come back in a new tank" or anything.