Filing these sentences away as an example for students of particularly bad writing:
"While a number of factors
contribute to lower accident rates, including increased helmet usage and
more bike lanes, less aggressive bicyclists probably helped, too.
Despite such statistics, lots of drivers assume all people on bikes are assholes like me."
A fine example of arguing through adjectives, and of how the unwillingness to be precise and bring up evidence makes it sound like you don't know anything. Translation: I have no specific support for the idea that this is true, but I want to write on this topic anyway.