Comment 10 for bug 389133

Why?

Users aren't stupid and will make the correct decision, IF things are properly laid out for them. In this solution, the buttons are very clearly labeled, providing two intuitive options. End Process Normally, meaning end this process as if I had pressed the 'X' button on the window, and Kill Process Forcibly, for when I've tried hitting the X button but it won't go away. Both options are necessary and intuitive because they are labeled properly. Having one as End Process and the other as Kill Process Forcibly is asymmetric and less explanatory. Implication is to be avoided in user interface design, being explicit is a good thing.

As for having only a kill button, this provides less power to the user and reintroduces the 'lonely button' problem.