I don't agree with the OP's take in this. It's just too easy to make Haslett the scapegoat for all that's ailing the defense. He's not the most creative defensive coordinator in the league, but perhaps people should ackknowledge that an unluckly mix of circumstances dictate he cobble together a defensive with a lot of players who are not currently starter-level quality.
How do you line up Madieu Williams to ensure he can perform? This crucial posiiton is manned by someone who makes a lot mental mistakes.
If its come down to playing Reed Doughty, how much can be done to ensure he can cover what Fletcher can't-- what drill do you practice to make these guys can run more quickly.
And Hall.... Was Haslett derelict in practicing the old "Don't Take Off Your Helmet and Cuss Out the Ref" drills? Let's be realistic, Hall simply lost complete control -- and forgot any messages of restraint that might have been drilled into him by his coaches. Should Haslett have suspended Hall a few games for that transgression -- considering the Skins have little or no talent behind him?
As for Hasletts control over his staff -- how effective would Haslett be in threatening to fire Morris or Slowik if the defensive secondary and linebackers performance doesn't improve? I think they all try to do the best they can and wait for what's going to transpire in the off-season.
The quality of executing plays is on the PLAYERS. Lapses in discipline on the field are on the players too. It's players who make the mental mistakes on the field that cost us. Okay, scheme design -- you can blame the coaches - but please remember that 10 yard cushions are often result of how well our corners' speed match up to the opposing WRs.
Bottom Line: No one is blame-free for the defense. Not Haslett, Morris, Hall, Wilson,Willliam, Jenkins, Bowen, etc. Nor is the offense for all their 3-&-outs, and dropped passes, sacks leading to changes of possession. The longer this defense is on the field the more it gets exposed and exploited. This is a team performance and it's getting old that we always single out Haslett.