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BTK was a dutiful husband, father, church going kinda, civil servant, guy. He didn't abuse his wife or kids, drink or do drugs and his relationships with his family members were as normal as white Chevrolets.
Ted Bundy had a GF who knew that LE was looking for a "Ted" who drove a beige VW bug and had a leg cast. She was living with Ted, he drove a beige VW and she found plaster and wrapping fabric in her bathroom. It never dawned on her. They had a great relationship, according to her. He wasn't a drunk or druggie.
That's just 2 off the top of my head.
Wayne Gacy. Family guy, pillar of the community with 17 or so dead bodies in his crawl space.
BG isn't being outed because he is completely normal. There is nothing suspect about him.