By default, the atom tree-view for browsing files/directories will open a file or collapse/expand a directory listing just by single-clicking on the entry.
This package changes this by forcing the user to double-click on a files. Directories can be opened by double-clicking the directory name or single-clicking the little arrow next to the directory name, as is the default behavior in most editors.
apm install dbclick-tree-view
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.