My rain bike for several years was equipped with Greenspeed Scorchers and I have never had an issue with traction in the rain. I just completed a short 110km overnight tour on my NWT that I thought was going to be mostly paved...turns out only 10kms was paved the rest was dirt, rocky and gravel...and it rained a ton! I wasn't expecting the Scorchers to handle that very well, but they surprised me and did great. No loss of traction pedaling up steep hills or braking down the other side.

Having said that there are some surfaces [painted lines, metal man hole covers, etc...] that are uber slippery for any tire in the rain and you have to be careful when encountering them. Your accident might have happened even with another tire. I've run Schwalbe Marathon Supremes and XRs in the rain without any issues.