Of those five talents, four
of them are new in Wrath of the Lich King. Justified Killing is particularly painful to lose. Those talents are dedicated
tanking talents, nevermind the bonuses tanks might receive from other talents they also can't reach such as Anger Management, Impale, and Improved Charge.
Why not? Because there are more than five points too many spent in non-utility talents that will affect us at every point of progression, from solo'ing to 5-mans to 25-man raiding. Even if this were gutted a bit in Protection, too many points would be at the bottom end of the tree, which would still prevent Justified Killing.
The plus side is that the rest of our talents are just that good
. Hopefully some will become even better. To get a quick overview of which talents I'm referring to: