Re: The most destructive ships in Star Trek history, and it was Vulcan
I'd argue the erasing of a civilization to the point that nobody is even aware it once existed is far more destructive than simply destroying the civilization. I'd go so far as to apply the term "violation" to it, as you're not only directly affecting the target but causing potentially massive amounts of collateral damage.
Hell, in this day and age you erase one human being who's reached the age of 40 or so and you're probably impacting the memories of at least a few hundred other people.
If I was faced with being murdered in an alley or never having existed to begin with, I'd choose the former every time.
It was the best of Trek, it was the worst of Trek...
"If I lean over, I leave myself open to wedgies, wet willies, or even the dreaded Rear Admiral!"