"Well, you are aware that the roads were built for cars right?"
Unless you're referring only to freeways, that's a nice bit of revisionism. Especially in any city older than 100 years, the streets were built to carry trolleys, horses, carriages, omnibuses, and a variety of vehicles just as slow as bicycles. And cycles continue to be legal to ride on those roads. So you're managing to be both historically and legally wrong.
"I'm going to go out to my local bike trails and ... throw handfuls of thumbtacks in front of all the bikers"
Unless you're referring only to freeways, that's a nice bit of revisionism. Especially in any city older than 100 years, the streets were built to carry trolleys, horses, carriages, omnibuses, and a variety of vehicles just as slow as bicycles. And cycles continue to be legal to ride on those roads. So you're managing to be both historically and legally wrong.
"I'm going to go out to my local bike trails and ... throw handfuls of thumbtacks in front of all the bikers"
I'd like to see how that works out for you.