I commend those who choose to birth unassisted, but I'm not sure it is a question of bravery. I do believe it is not the right choice for most people. It is a great option, but it isn't the pinnacle of the birth hierarchy.
I'm very into the natural birth home birth scene, and I adore it, but I try hard to make sure everyone knows that it was my choice not that I think everyone should be doing it.
Personal choice
I agree with Bassedesire. All women facing childbirth are courageous. However, I do believe freebirthers have to be brave in a different way to those who have medical professionals caring for them when they birth because freebirthers have to face hostility and scaremongering from the media, medical professionals, the general community, sometimes the government and almost allways their family and friends (unless they too are freebirthers). Just as folk love to tell horror birth stories to pregnant women with freebirthers they make it their business to emphasise the "danger" of UC to freebirthers. Its one of the reasons many keep it to ourselves.
I can only speak for the climate in Australia where I have birthed. A number of women have been threatened with DOCS (Dept of Community Services) by hospital staff, some women have had police turn up to their homes when in labour, they have gone on to registers because of supposedly putting their unborn child in danger.
I was told by a doctor and by a Births Deaths & Marriages clerk it was illegal to freebirth. I was told that in order to get a birth certificate for my child I had to take the baby to a hospital after the birth or alternatively show a video of me birthing to the staff at Birth Deaths and Marriages. I was told by my mother that I didn't care if my baby died. My friend was told by a midwife at her hospital pre natal clinic - after taking her into a room and closing the door - that she didn't believe freebirth was safe and unless she changed her plans she'd report her to DOCS.
I've been told I"m brave to freebirth and it did take significant courage to fend off all the negative scaremongering and freebirth regardless.
I freebirthed because it was just right for me. I know the difference because I also had a hospital birth and a midwife attended homebirth previously. Those two births taught me that I need privacy and quiet and control to feel safe and happy birthing. The people in my birth space the first two times made it painful, uncomfortable, unpleasant and I felt distracted and irritated by their noises, movement, talking, mere presence plus they all wanted to have input which was annoying as hell. I want complete silence and I want no spectators and I don't want midwives trying to control me and bringing their medical equipment into my peaceful birthspace. I am not comfortable in cars (I don't drive because of this) and for me a car ride in labour is hellish. I had every reason to believe I wouldn't need medical assistance and plans in place if I did need help.
Because of the hostile climate in Australia towards freebirth (an indeed towards homebirth in general) some women who know they won't qualify for birth centers and who can't find a midwife to attend them at home feel pressured into freebirthing to avoid hospital - this is very dangerous as it's forcing women to choose UC for the wrong reasons which can put mother's and babies at risk.
If it's what you want and you know it I say go for it but only for the right reasons.