I noted in the past that the tone of the Early Period was largely one of triumphalism, an endless declaration that Muir's ideals were right, his opponents were wrong, and everything was going to go this way forever. While much of this could be chalked up to Muir's own political attitudes, it was also the result of the time it was created in. The Early Mystery Business(tm) Period, after all, did not just begin 2002, but November of 2002, where the combination of the post-9/11 bump, a particularly listless Democratic Party campaign, and just a pinch of gerrymandering had resulted in the Republicans not only gaining the Senate, but increasing their seats in the House, something that seldom happens for the President's party in midterms. This era of partisan triumph floated right over the 2004 elections, where there was another increase of the House majority (albeit with gerrymandering playing an even bigger part) and Bush not only was re-elected, but won a majority of the popular vote. While Muir was overstating things and painting them in his usual hamfisted, delirious manner, this was the brief time when he was roughly in sync with the zeitgeist. Pundits and political analysts talked of a permanent Republican majority. The opposition to the Iraq War, while substantial, was largely treated as an impotent, quixotic movement, and, initially, this helped make it so. And so Muir started 2005, when remember, his strip was truly entering the public eye, in high spirits.
In retrospect, of course, this very appearance of incredible power was deceptive. Bush's popular vote victory was quite narrow, especially for a wartime incumbent. The Republican majority was built on many narrow wins and was far less functional than one would think, as the cynical pragmatists had been gradually starting to get replaced by incompetent true believers, a process that was going to get worse in the years ahead as newer, more delusional strains of fanatics. Corruption was endemic for both brands, simply because the GOP's dominant brand of cynicism breeds crooks and opportunists. And the opposition to many of Bush's policies was stronger than it seemed, while the support was more shallow.
And of course, there was a simple fact--most of the W. Bush administration's signature policies were bad ideas. Most notably, that war Muir was so very fond of. And as bad ideas are wont to, they went badly. Especially, once again, that war. But all of this was going to take a while to set in. What happened first was the W. Bush administration blowing its political capital on two failed initiatives in a monumental act of hubris, a move to partially privatize Social Security that offended the Left and Center... and a move for an immigrant amnesty that offended the Right. Muir himself would even grumble about that one, though not for very long, as he had other things to worry about. (Though whenever the amnesty proposals popped up during the remainder of Dubya's term, he would grumble once again.) Such as Hurricane Katrina demonstrating just how Dubya's tendency to cut spending and rely on cronyism had gutted necessary programs that had only a decade earlier been considered models.
Simply put, over the next two years, Muir would watch as the forces he'd seen as eternally triumphant crumbled and backslid, as the actions he'd seen as glorious successes turned to grotesque failures, as the national soundtrack turned from 'Have You Forgotten?' by Darryl Worley to 'Holiday' by Green Day . And as that happened, the tone of DbD shifted slightly. Muir became whinier, more defensive. The strip shifted from constant gloating to long stretches of Muir explaining how people were being idiots trusting their lying eyes. Major issues and disappointments were either sidestepped and minimized, like Katrina, or saw Muir actively gaslighting on the mater, such as, well, what was happening in Iraq. Still, Muir was clearly operating from the assumption this was all just temporary disturbances, and that nothing would really change. Which at least partially explains the next character who'd be joining the cast. But this atmosphere was going to hang around for the rest of the Mystery Business (tm) Era, and even into the start of the Transition Era.
Get used to it, and frankly enjoy it while it's here, because what would follow would be worse.