I wouldn't put Robertson and Falwell in the same category. They're both staunch religious conservatives, but one (Robertson) is a little lolo (as they say in Hawaii--crazy), while the other (Falwell) is just dogmatic. Robertson is a little nuts.
Falwell has actually grown a lot over the years. He was somewhat of a bigot in his early years, but these days just appears to be a hard-line religious conservative. He made what I thought was an interesting observation a while ago about homosexuality. He doesn't believe homosexuality is genetic, but believes some people are more susceptible and are tempted more often than others.
Sort of makes sense. Satan (if you believe in him) tempts people in areas where they have weaknesses. Some people have trouble with alcohol, drugs, porn, food, etc. For instance, someone who grew up around an alcoholic father and has a high alcohol tolerance may have greater alcohol temptations. Maybe people who become homosexuals are more prone to that behavior, are bombarded with temptations, and ultimately yield? Not something you can prove scientifically, but makes sense (to me) from a religious standpoint.