Players have always been able to kill low level characters, this isn't something new with CRZ.
PvP realms were designed right from the get-go to be a place where random acts of PvP could take place (outside of a handful of safe zones), and we have no plans to change this.
Ganking is always a threat on these realms, there have always been players who enjoy it and who go out of their way to do so. It just comes with the PvP realm unfortunately.
No, no, no.
Ganking is an outdated and useless mechanic that serves as nothing but accepted griefing/bullying. Same level pvp is FINE - but a lvl90 with 350.000 health vs someone with 2000 health is not challenging and again serves no purpose other than to let the high level be a prick.
Back in vanilla when "ganking" also existed, there was much less difference in the health of a level 40 and a level 60. Sure the level 60 would be red but in many cases a couple of 40s could fight back a level 60. Didn't happen often, but it could be done.
Before cross-realm zoning this ... issue existed yes. But CRZ magnified that problem by a large amount. The biggest issue with "ganking" not being fun or serving any purpose is because of the stupidity of the bloated stats this game has now.
Give people a chance to actually fight back and not just be one-shot with a overkill 20 times their actual health. Until you fix that, and change the perimiters of CRZ rules (nodes, etc) - disable or give people a choice.
I think it would be healthy for Blizzard to own up, push the pride aside - admit CRZ in it's current form isn't ideal and start working on sorting these issues out.