"I can't see why mothers are frightened of medical staff-they are there to help and they do the job because they enjoy it. "
Yes - because unlike teachers, mechanics, lawyers etc, health professionals are ALWAYS brilliant at their jobs, always competent, and always supported by their institutions to practice in an optimal way. Oh, and bullying doesn't exist in the health service. 
"Stand up to it. If you don't like the staff say so and get someone else."
You just don't get it do you?
" Don't put your baby's life at risk because of it".
People can't help their feelings, no matter how much bossy individuals tell them to 'pull themselves together'.
Try it with someone with a spider phobia. When they say they're terrified of spiders just say 'don't be silly! it's not going to hurt you!', then pick up a big hairy one and drop it into their lap. See what happens.
"You can arrange a home birth and have some say in the midwife."
What rubbish! Unless you have a case-loading team you will get who ever is free on the night. In theory you could send her away if you didn't like her. In practice it never happens. Because labouring women are not usually up to dealing with this type of conflict while also trying to deliver their babies.
"Freebirth seems to be saying that any doctor or midwife , or even all doctors and midwives, are going to be set on giving you a horrible birth experience."
No it's not. Women do it because they believe that the presence of a health professional will prevent them having the truly undisturbed birth that they believe is most likely to result in a safe and easy delivery. OK - they're doing it because they feel it will give them an easier birth, which is better for them and better for their baby. And you know, going on what evidence there is -THEY ARE USUALLY RIGHT.
"I haven't read anything that doesn't convince me that they are self indulgent women who put themselves first."
Sigh. Because you're not listening.