I agree, Linzy, that it's hard to find unbiased facts. And perhaps that's because, though the facts don't change from one side to the other, how important those facts are are different to both sides... so it's hard to find the info all in one place. The best I've been able to do is simply get both sides from different sources, and then consider all the information I've gathered.
For your colleague at work to make that "Russian roulette" comment is just ridiculous... it's as if people think you haven't carefully considered your decision, and they think that once they say that you'll go, "What? It could be risky? Ohhhhh... I'd better think again!"
I had a woman the other day, when I was at the gas station buying a Diet Coke, and she started to ring me up without the drink. I said, "Oh and this too." and she paused, and then said, "Oh... for your husband?" and I said, "Nope.. for me..." and she leaned closer to me and almost whispered, "But... aren't you... pregnant?"
I wanted to fake a really shocked face, let my hands fly to my belly and say, "Oh!! So I am!! Well, no Coke for me. Whew! That was a close one..."
I realize my caffeine story is a totally different level than your decision to have a homebirth, but it just makes me think : People have got to stop and realize that women aren't stupid...and that you didn't just wake up one day and say, "Well, I don't really feel like going alllll the way to the hospital... I mean packing a bag is such a drag.... I think I'll just deliver here. Whew. Glad that's settled."
Hope you told your colleague where to stick it.... as nicely as you could manage.