Democratic governments have been performing assassinations for a very long time.
This is nothing new. You wouldn’t need more than a brief political oversight to start listing the cases. In fact, I’ll bet you that “democratic” governments are responsible for more assassinations than any fascist/communist government. It’s a democratic trait, just another political tool. I’m not only talking about people that have already openly committed genocide, such as Saddam Hussein. They’re not the only people being arrested by foreign military. Don’t stroke yourselves people, if practical democracy was anything like the philosophical version, I’m sure we’d have more wars, and I’m sure more innocent people would have died by now.
It’s very easy to go on. In case you want fresh material, look at the heavy foreign military presence in the Middle-East. How many times haven’t we (I’m from Sweden, presence in Afghanistan) arrested/executed rebellious leaders and small-time gangsters because they had a high probability of attaining bombs, bigger guns and killing a whole lot of people?
You don’t want to kill Adolf Hitler because you’re afraid it’s going to undermine democracy? I wouldn’t care too much – because if your democratic government had that option, they’d do it for you.