I mean what I said. It is worse.
Although this isn't politically correct, there's a kind of sacred mythology built up around 9/11. About 3,000 people died. That's obviously bad, but as horrible as this might sound, worse things have happened. In terms of strict utilitarian "bad," the greatest harm to the greatest number of people, many things have been worse, and many things in the future will be worse. The wars in Iraq and Afghanistan were probably worse overall.
Trump, with a Republican Congress and multiple Supreme Court picks, is potentially the end of American democracy and freedom. It's hard to overstate the potential harm. Consider what he's already done. He's put a white-supremacist publisher in the White House, together with the Republican Party chairman. He's threatened political opponents with prosecution. He's refused to even acknowledge his many conflicts of interest involving his businesses, and he's already reportedly wielded political power for personal profit (in the phone call with the Argentine prime minister regarding a business project).
If you think there's no way a Trump presidency could be worse than 3,000 people dying, you've got another think coming...