Why is fixed better on wet?

did a search didn't really find an answer to this. i know i've read it somewhere on here i think. did usual wiki and google searches and got some answers but would be interested in youse guys opinions

I think the physics of it is similar to cars - a little bit of accelerator round a corner gives more traction than coasting, and in a similar vein I imagine that pedaling round a corner gives a bit more traction than freewheeling round one.
That could of course could well be utter nonsense, and it still doesn't tell you why it may be so.