Because he should.
Considering using allegations about the mental health of an opponent's wife leaves the line of decency miles behind. Similarly, whether or not David Cameron may have had a sexually transmitted disease during his student days is entirely a matter for him. I'm not sure about the allegations regarding two Tory MPs having a fling - that would only be a relevant issue if hypocrisy came into play. The Gideon Osborne pictures would add to the general entertainment of the nation, but I'm not sure that they would enhance the Labour case very much. (If, of course, any of this is true in any way at all).
The strongest storyline is alleging that a Tory MP is advancing his partner's business interests through use of Commons facilities without declaring the connection. That's fair game and of public interest - if it can be evidenced.
Frankly, guys, if this is going to be the main push of the election campaign, then we might as well start planning for opposition, because we'll deserve no better.
We've got good arguments to make on policy issues, but wading through the same sewers as Guido Fawkes - who proclaims his loathing of all politicians, but is comfortably settled on a pro-Tory agenda - isn't the place we should be and it isn't the place that the public want their politicians to be. If you start throwing crap around, don't be surprised it some of it sticks to you and the people decide that none of you are up to the job.
Draper wasn't elected as the leader of the Labour blogosphere, nor did he assume that 'leadership' as a result of being better than the rest - there are plenty who write better than he does, some of whom appear in the list of bloggers to the right of this article.
We certainly need to sharpen up our online approach, but if the top echelons of the party think that Draper and this childish behaviour is the answer, then I would suggest that they have yet to fully understand the question.
Time to move on, Derek.
Let's start getting it right.