How can you get so het up over all of this?
Perhaps because people get killed fairly regularly (I mean to say a number of them get killed, not that a particular person gets killed more than once
) through the loss of separation between the ground and the aircraft.
A lot of the argument comes down to VFR v. IFR. There is a heavy VFR bias in this forum; even more so in most other pilot forums.
One could be pedantic and say that in VFR one must maintain VMC, so end of debate. Unfortunately, nobody (unless they have just got to the bottom of their last bottle of Prozac) is going to fly into the ground knowingly, and clouds are a common thing in most of the world, so it must be assumed that a lot of people do end up not seeing where they are going. Accidentally or intentionally; I think it's fair to say that most pilots that "go places" do from time to time fly in IMC under VFR. It's illegal but surely it's reasonable to discuss ways to avoid getting killed while doing it.
And getting QFE and QNH getting mixed up is a great way to get killed.
If
IFR then confusion (and loss of obstacle clearance) is almost certain to happen unless one avoids using QFE and sticks to QNH. It's not a case of everybody doing what they are used to; it's a case of "this way is safer because there is less chance of an error".