I'm going to presume that is a sarcasm emoji in this context (happy to be corrected):
The WHOLE POINT of this is to convert some drivers into cyclists. You can either buy into this, or not. Hence the thread name: "positive".
Meanwhile, I don't really see that winter weather makes a lot of difference to the "aggresive driver" count. Sure, there will be some more drivers in the winter - but they won't be a statistically significant difference in terms of danger; there are many many more significant factors. IMO the more drivers that cycle in fair weather, the less careless they will be as drivers - that's reasonable, isn't it?