Lets say Mark gets in a waterballoon fight, but with the balloons full of gasoline. Lets say this happens in hospital. Mark is aware that his behavior is likely to result in great harm, many deaths. He doesn't _want_ people to die, it's not his goal, he just doesn't care that he's putting them in danger. He wants to have fun with his balloons, and that's all that matters to him.

Mark isn't trying to kill people. Mark _is_ evil, because he chooses to take actions that are likely to cause great harm.