pro-tip: never fasten the nut around the valve that holds it to the rim, unless you know with certainty that the road will always be smooth. Any larger than normal bump will rip the tire at joint. Just keep it loosely on, but not tight.
Very good one, and similarly if you get out while it's cold and store your bike in a hot place, don't tidy that screw. I've had it fail once precisely on these conditions
Are you referring to Presta valves? It's ok/recommended to discard the nut on the valve stem?
Yes presta too. I wouldn't discard the nut, since it provides a good support when pumping the tire, but just don't fasten it on tightl - maybe leave a few centimeters.
You need more tire pressure then. Either that, or you're using tires with some heavy-duty puncture protection.
Do you not partially inflate the tube prior to tucking the tire bead under the rim? This prevents the pinch in the first place. Source: learned this handy trick in the middle of the northern Nevada desert, ~50 miles from anywhere during a cross country ride, from a perfectly-timed stranger riding the other way.
This thread reminds me of biking in to work with a friend. He managed to pop both his tires on the same wedge shaped rock.