LaraC to go back a few posts, yes vaginal births do occasionally result in dreadful things happening. Recto vaginal fistulas are common in the developing world where many women labour for days and don't have easy recourse to life saving caesarean sections.
Often their babies die and they are left with dreadful morbidities that last for the rest of their lives. They are extremely rare in the UK, in fact I think I have only heard of it happening once or twice. Yes sometimes forceps and ventouse births go wrong with horrible consequences for mother and fetus, but this is extremely rare as well, it happened more often twenty years ago when they used rotational forceps, which they rarely use now.
I have seen some difficult births of all types in my time, yes el cs is safer than em cs but sometimes they can go horribly wrong (more likely of course if there are other factors as someone else has pointed out, but not exclusively) Also the more sections someone has the more likely serious problems are to occur, so a third section is FAR riskier than a first section (which won't be a problem for you as you don't plan more children, but many obs will advise women who plan to have more than two children to go for a vbac due to the far greater risks of repeat section.)
No one ever has to accept a forceps delivery, if someone has strong feelings about it it needs to be fully discussed and written down antenatally so that this will be respected without discussion if it happens at the time, I can honestly say in 16 years that I have never seen anyone pressurize a woman into having a forceps or ventouse delivery, if I did I would stand up for the woman. To continue without her consent is assault and could result in a jail sentance, I do remember one woman who did not consent to an instrumental and ended up having a section. I wasn't there at the time but she told me about it herself, sounded like they tried to persuade her and she just refused. A section is quite a bit riskier when the woman is fully dilated though so a low forceps or ventouse is likely to be safer to mother and fetus in most but not all cases.
I'm not trying to upset anyone here just to provide some balance for the people who feel that sections are completely safe. If only it was all simpler! I hadn't realised before reading this thread quite how few private obs there were, although I know that there aren't any in my area.