It amazes me how little people actually care about their security (and do not confuse security with privacy here). Apple is trying to protect its users, but they are too stupid to realize.
But on the other hand, Availability is a part of the CIA triad so bricking the phone does violate this premise.
However, Apple is doing this because a piece of hardware inserted between the Touch-ID Sensor and the Secure Enclave could in theory either intercept scans or access the enclave.
They are doing this to protect you, not as a "screw you for trying to fix your own phone." People will always see what they want to see though, I suppose.