Drudge has no doubt had discussions with lawyers. There have been constant efforts by people who dislike the often conservative slant to his site's content, to "regulate" and/or "shut down" the site.
The hugely-popular aggregate site has been targeted by powerful 'Crats with accusations of pro-conservative bias - and use that as a basis for effort to apply regulatory restrictions or worse on the Drudge Report.
By posting content from non-conservative sites, he essentially inoculates the site from such criticisms and ameliorates the problems associated with it from a legislative POV.
IOW, he's being diplomatic for the sake of the long-term security of the site and helping to fortify any argument his legal defense might need to combat attacks against him from leftist zealots in government.