DC does have a problem, but some of the deaths I think are self induced. IMHO some of the bike riders are dangerous, they seem to have made up their own set of rules that combine motor vehicle rules with pedestrian rules.
I see it here too, but in DC the traffic density and even the lanes don't allow for mistakes.
Again, the buses are one of the biggest hazards as they don't seem to give a sheet over anyone but their own right of way.
The roads are a mess, potholes are unreal. On street parking is random and capricious, enforcement isn't a bad idea, just not your unfriendly neighbor on the block.
But they aren't going to reduce private vehicles, taxis (including Uber) if they don't improve mass transit.
METRO has declined over the years, and a large part of it is wasteful spending. They know they lose millions a year in lost fair from people jumping the gates, and they pretty much know who does it. What WMATA has said is we condone being a hoodlum, any wonder DC has a problem and fewer people will want to use METRO or the bus?