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Yes, it's normal and yes, you can snap them off.

It is likely root maggots. This article will help:
https://urbanext.illinois.edu/vegproblems/rootmaggots.html

I have never heard of this before. This article will help with growing corn: https://www.gardeningknowhow.com/edible/vegetables/corn/how-to-grow-corn.htm

This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/animals/get-rid-squirrels.htm

The corn earworm pest, also known as tomato worm, is the most common
garden enemy with regards to corn. Apply 5 drops of mineral oil or corn oil (apply only once) to corn ear tips when the silks begin to turn brown. If the eggs and larvae survive this barrier, use a knife to cut off affected ear tips before cooking. Most of the remaining ear will be clean and very edible. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/insects/corn-earworm-control.htm

Try to stand it up. It may not recover, but it will definitely not recover if left laying down. If you stand it up, it has a chance that it will be able to still grow normally, though it will need to be propped up until harvest.