One person claims to have sighted a "scary clown", and now there are masses claiming to see scary clowns. Much like ghosts, bigfoot, chupacabra, alien abductions, astrology, numerology, parapsychology and a host of other such nonsense, it's more proof that there are a tremendous number of weak minded people running around. Rather than look at it with a healthy dose of skepticism, there are a lot of people who accept garbage like that at face value.
Too many people can't separate a Stephen King book or Hollywood movie from reality.