Junktown and NCR mine have always been dangerous. Hunting around those town and the Hub is dangerous too with high level who love to shoot bluesuits.
If you don't want to be annoyed by those kind of players, go to Klamath. There's a mine, easy encounters, Modoc is not far for Brahmin skins (so you can make tents).
Or you can go to San Francisco mine, this is a much better place, and you have cities near for footlocker hunting.
So be humble, and move to better places instead of staying where all noobs are instead of blaming morons.
It's pretty easy to avoid them.