This is because of the "don't spend money on anything that doesn't benefit me" mindset. I would argue that after commuting to DC for decades, we'd all be safer if everyone slowed down a bit. One accident, police car, etc can really upset the apple cart. Just today there was a construction project on N Capital where they closed lanes on each part of the intersection. Buses stopping in the remaining single lane, equipment blocking parts, etc. The workers don't care that it took over 30 mins to traverse that single block. Moving the bikes into their space and keeping them safe reduces incidents and the same complainers won't like them taking a lane in the roadway, despite the fact that they can probably ride 25MPH.