It's funny...
...quite some time back, it looked like the Org was aiming to quietly phase out the blood prohibition (whilst going out of their way to avoid appearing as though they were phasing it out, of course).
The world around them changed considerably from 9-11 onward, though.
Instead, now - especially due, I'm sure, to all the increasing pressures they're currently experiencing - they've chosen to dig in their heels instead.
This is telling, because it's absolutely what True Believers would do if/when they...
a) ...are certain that God's got their back no matter what...
b) ...view the secular world with extreme suspicion, and...
c) ...genuinely believe the End really is Nigh.