Your second diagram implies that only the "high quality" ruin should be covered, and then not all of it.
A vast majority of the ruins are still all concentrated within that area, or at least the ones that are known. But regardless, even those not in the area were still protected under the Antiquities Act and it was still a Federal crime to vandalism or steal from them. I'm not sure what adding more "protection" is really going to accomplish.
You'll have no problem providing a source from this ample documentation, I'm sure. It's a fact of life that things get vandalized and destroyed regardless of status. The "now everybody knows about it" argument has two sides of course, surely many people want to know about such sites?
Anyone who wanted to know about it could know about it, the Utah Board of Tourism talked about it.
And I'm slightly surprised you're asking for documentation, it seems like common sense that the more publicly accessible a place is, the more people will go there, and thus have an increase chance of vandalism. It's also been well documented in the news as well. But here you go:
Between 2011 and 2016, there were 25 reported incidents of vandalism and looting at Bears Ears (
source), while the Grand Staircase Escalante had 1,400 reported incidents in just 2015 (
source). These two places are about 200 miles apart so relatively close.
While this is an opinion piece, it does demonstrate vandalism in National Parks:
http://beforeitsnews.com/opinion-co...creases-vandalism-to-antiquities-3175745.html
Another set of articles showing "artist" defacing various parts of National Parks:
http://www.modernhiker.com/2014/10/21/instagram-artist-defaces-national-parks/
https://www.nps.gov/orgs/1563/nocket-sentenced-for-vandalism.htm
Another example:
http://www.sltrib.com/news/3741977-155/vandalism-increasing-in-utah-national-parks
Another:
http://www.sltrib.com/news/1739757-155/parks-national-graffiti-artist-art-rock
One from outside Utah:
http://www.cntraveler.com/story/vandals-destroy-duckbill-rock-formation-at-oregon-national-park
Even celebrities do it:
http://blogs.findlaw.com/celebrity_...es-5000-fine-for-national-park-vandalism.html
So far you're making more of an argument for protection that against. Sourcing water from Monument areas isn't unprecedented anyway... but allowing cattle (a very destructive force) or off-roading (equally destructive, cos physics) seems mad. If that's the kind of thing that would happen under the State's governance then surely there's a good argument for Federal protection to stop it?
As I've pointed out, it was already protected to the extent that the Federal Government could protect it. Making it a National Monument isn't going to protect it any more than it already was and it's only going to expose it to more people, which will increase the likelihood something is damaged. As for the ranching, it was done outside the area where the ruins are, same goes for off roading. I can't speak for ranchers, but I can safely say a majority of off roaders practice a "tread lightly" policy since they know if they destroy the land they will loose access to it. Yes, there are some ignorant rednecks in jacked up Ford F-350's that will tear through things without consideration of the land around it, but for the most part off roaders stick to designated routes and areas.
And the state was doing a fine job protecting it since there were only a handful of incidents that occurred in the area.
Tourism doesn't have to die in Monument areas - in fact it the "everybody knows about it" effect can be a positive one. The industry needs to adapt - as I'm sure it will, as it always does.
It's very seasonal. Tourism in those areas will only occur during the summer, whereas ranching, mining, forestry, etc can happen all year around.
There's a lot of tourism in Utah outside that area of course, that remains untouched, as do the other cornerstones of Utah's economy (oil, gas, information et al).
Yes, there is a ton of tourism outside that area, but that doesn't help the people living there does it? It is the poorest area in the state, doing something to damage and already iffy economy seems like a bad move. If Utah allowed gambling there could at least be casinos in that area to offset the economy, but we don't allow gambling and probably never will so that's not an option.
You also need to consider that the Federal Government already owns something like 70% of Utah with only Nevada having a larger percentage of Federal land. Because of this the state doesn't benefit nearly as much as it should from the extraction of natural resources (nor has a say in it) since the Federal Government owns the land. To me, it seems like a violation of the Tenth Amendment and state's rights.
I think it's also important to consider that the Native population of the area didn't want this and that they consider the lands to be sacred.