I wonder how much important information we are not provided about the bear? All bears I know about that broke into buildings (I would include open windows) fit into one of following categories: 1) they already had been breaking into buildings, perhaps learned from a mother bear, 2) their ability to feed on natural foods had been seriously compromised by old age, illness, injury, gunshot wound, 3) food and/or food residue left outside of closed containers provided immediate incentive for a hungry bear to break in.
I have never been close to the cabins at Estes Park but doubt that the windows are very bear proof, even if locked, especially against a motivated bear. I also doubt that much emphasis is placed on cabin renters securing food away from bears, as opposed to folks sleeping in tents. Most folks would consider food in a fridge to be secured. Wish article had such missing information.
I also wonder why the family did not retreat, which is pretty SOP if possible -- again, missing information.
Some towns in Colorado's have very persistent bear problems, especially when natural foods are scarce in surrounding areas. Garbage containers, fruit trees, berry patches, etc. are magnets. Some campgrounds are closed because of foraging bears. Many years ago in Montana a mamma grizzly and her two cubs were nightly visitors to a very prolific apple tree only 10s of meters from our bedroom window. A few nights and the apples were gone, no more bear watching-- bummer.
Niklas