He's right. A Venn diagram is meant to show the overlap between two groups of things -- ideally, to scale. One problem with the Clinton diagram, for example, is that "gun owners" in this context ...

The basic design the Defiant Stock I is derived from the CZ 75 pistol, the Czech semi-automatic that’s spawned an estimated one million offspring. Mechanically, one important facet of the CZ 75 ...