The KKK began to (again) fade away before 1930 came along, and was blip on the radar when WWII started. When the civil rights movement gained steam, individuals who likely already had negative sentiments about black people donned robes and organized- using a form of terror that more or less had not existed since late 1800s. The same is why more people are loudly and openly opposed to homosexuality (and gay rigths) even though society is becoming increasingly accepting of homosexuals. Similarly, a bulk of gun buyers fall into one of 2 catagories:Really? I think the record number of gun purchases over the past few years and the mass spreading of knowledge (and dispelling of misinformation) over the wonderful medium of the Internet, would prove otherwise.
1. Buying cause they fear Obama is going to take them (akin to donning robes in the '60s to prevent black people from ruinning traditional Southern social heirarchy, or, pushing for an anti-gay-marriage referendum that nobody would have thought of 5 years ago- because of overt displays of black and gay rights)
2. Individuals who are stocking deeper for one of several reasons, and individuals who grew up around guns and are coming of age to buy their own.
There are exceptions, but those 2 points reflect the bulk of purchasers. The internet simply gives a minority group (in this case OCers) a place to vocally communicate from a distance to other members of their minority group.