Mayor Bill de Blasio has aggressively pushed a bike-friendly agenda, adding about 100 miles of dedicated lanes for cyclists amid a spike in rider collisions, but he’s done little to address the danger that bikers themselves pose. Since 2011, bicyclists have injured more than 2,250 pedestrians — including at least seven who died — according to stats from the city Department of Transportation and published reports. Injuries are up 12 percent this year, rising to 127 through June 30 from 113 over the same period in 2018, the NYPD says...