As they should. One of the big mistakes we Americans tend to make is seeing every conflict as "good guys versus bad guys." More often, it's "very awful guys versus slightly less awful guys." The key is to figure out who is most awful.
In this case, it is Yanukovich. He has been backed (funded) by Putin, an ex(?) KGB officer who is turning back liberty in Russia and re-asserting Soviet claims on his neighbors. He is supporting Iran's nuclear ambitions with money and materials. He is opposing us in Iraq. He has already effectively installed a puppet government in Belarus. Where does he intend to stop? Don't know, but personally, I'd like to stop it for him...right here and right now.
Soros is bad news, no doubt. And I am sure that Yuschenko is no angel. But this is much bigger than personalities. It is about geopolitics, and we cannot afford to lose on that level.