I would only go on a guided tour where armed guards are provided by the government for protection.
Egypt is an unsafe country, and I would advise against going. The risk to westerners is too great.
I strongly advise against doing Egypt on your own... if you go with a tour group, you will have armed guards escorting you.
Americans should not go to Egypt, the people there think we are the enemy.
These are all direct quotes from this forum.
When I was there a few months ago, there certainly wasn't a need for armed guards, and none of the groups I saw had them. Honestly I question whether people saying you need armed guards have even been to Egypt. I don't mean to say that Egypt is a paradise where nothing bad happens, but there's more crime against tourists in most places in Europe. Do you need armed guards for your next trip to London?
I agree with the sentiment that traveling with a group in Egypt is probably a good idea, but solo travel in Egypt is definitely not dangerous, and shouldn't be discouraged, especially for people who have experience with solo travel.
So, what are everyone else's thoughts on travel to Egypt?
Edit 23:30 EST
I'm not doubting that women face extra issues that men don't, nor am I saying solo travel in Egypt is without risks, especially for women. This post is in response to broad statements on this forum that are discouraging everybody from traveling to Egypt.
If people were saying "Women should use caution when traveling to Egypt" or "Women should probably not travel Egypt solo", then I wouldn't have an issue with it but that's a very different statement to make from 'Americans should avoid Egypt, the people there consider us the enemy.'
Also I'd like to clarify that when I say Egypt isn't dangerous, I don't mean to say it's without risks. I just mean to say that it isn't the terror-ridden wasteland many Americans seem to consider it to be.