Do you guys only shoot when you clearly know what your shooting at is a deer?
ABSOLUTELY!!! Know your target, and whats behind it!
What do you think is it really nessecary to wear something bright?
You need to check your state regs.Most states require blaze orange clothing to be worn while hunting with a firearm.
Are people that stupid that they would shoot at a noise and not what they see?
Their are some people that stupid, yes. I cannot count the number of times I have read stories of people being shot because they were mistaken as game.
Good luck, and be safe. I would suggest taking a hunters safety course.