I spent 20 years as a professional home inspector and always opened and inspected attics. Frankly, I cannot see why anyone would not want to do this. Sure, sometimes the work we do as inspectors may be considered somewhat intrusive or even impolite by the uninformed. But inspection procedures that result, for example, in letting some heat escape through the attic hatch during a mid-winter inspection or turning on the furnace to test it when it's midsummer and 100 degrees outside are necessary for the "greater good" of determining the condition of the home.
In a very cold environment like Alaska, roof structural problems are common and many can only be determined through inspection of the structure. These could include cracked trusses or rafters from snow load, rotted roof sheathing from excessive attic condensation, ice dam leaks, etc. Not only is an attic inspection suggested, it is also required by the Standards of Practice of the American Society of Home Inspectors.
So, don't be shy about doing your job. But here's a little trick of the trade I learned the hard way which can make it go more smoothly: never "announce" to the folks present that you are about to open the attic hatch to inspect this area. Just do it. Chances are no one will even notice before the job is all done. When I was a young and inexperienced home inspector doing inspections on hot summer days, I used to politely tell the owners of the home, along with their real estate agents, that I needed to test the furnace. I noticed that this resulted in an immediate and psychosomatic rise in their perceived discomfort in the home. As soon as I said "test the furnace" they got hot, even though I had not touched the thermostat! Hence, I learned to just do the test and by the time it was all over, they never noticed and we got thorough the inspection with everyone's comfort intact. The same should be true of entering a home's attic during a wintertime home attic inspection.