It's not safe at all. Read the news about kidnapping the bitcoint holders in Kiev and Odessa first. If it's not enough I can continue.
Isolated incidents can't be used to tarnish a country. As far as I know, Ukraine is pretty safe for anyone, as long as you avoid the troubled areas and stay away from the drug paddlers. At least when you compare Ukraine to other expat destinations such as South Africa and Indonesia, the former looks like a heaven. But language problems can be a concern though.
Yes, I agree with you on your statement that Isolated incident can't be used to tarnish a whole country, It is not the way to read the whole picture of a country. These type of incident can occur in any country. For a example Anders Breivik's mass murderer scene in Norway doesn't approve that Norway is unsafe for people. Of course Norway one of safest places to live. That was only Isolates incident from a crazy man.