I don’t think it’s DC. The branch of DDOT that does bikes and peds is “Policy, Planning and Sustainability Administration”, headed by Sam Zimbabwe. For at least a decade the lead person for bike/ped programs has been Jim Sebastian, and though his title has shifted around a little over the years it’s never included “safety”. (As far as I know DC doesn’t have anybody specifically concerned with bike / ped safety. That’s not snark – all traffic safety is done by the “Transportation Operations Administration” branch of DDOT.)
Also, US-DOT employees have been hit and even killed by traffic on M St. before, which resulted in exactly no meaningful changes on that highway-disguised-as-street.