I'm not one to worry much about SIDS. No one knows what causes it and there are people that follow SIDS guidelines to a T and still lose their child to SIDS. My son had a bumper and so will my daughter, however they don't go into their crib until about 8 or 9 months. Just do what you are comfortable doing. It doesn't make you a bad mom if you do use one.
Seems like kind of a flippant thing to say.
No one knows yet what causes it definitively and there are a myriad of reasons that contribute to it.
However the more research is done, the more babies are saved. The guidelines are there because the research has shown a higher risk for certain things. Genetics may certainly play a part and this may be part of the reason why some babies die despite their parents following the guidelines.
For me personally, I trust the research and I follow the guidelines. My eldest daughter had a bumper on her cot (she's 15 now) but none of the others did because new guidelines came out, which I was happy to follow. The rate of SIDS has dropped dramatically since the research guidelines started being implemented. This alone tells me that they are on the right track and I will trust them.
Babies can and do wriggle around despite being wrapped and despite a bumper only being at the top of the cot, they can still wriggle to it in the middle of the night so the risk is potentially still there.
I had a brother who died of SIDS when he was 11 months old. I will take every guideline the researchers can give me and say thank you very much.
To say that you don't worry about, and won't use their guidelines because sometimes babies die anyway, is like saying you would cross a busy highway without looking cause sometimes people get hit by cars and die even when they did look. You do what you can to prevent things happening, not live in ignorance because bad things happen anyway. That's my take on it anyway.