Even by the nightmarish standards of the empire she oversees, Susan Wojcicki, the chief executive officer of YouTube, has had a dreadful start to 2019. During a single week in February, BuzzFeed reported that her company was running advertisements alongside anti-vaccine content; there was a nationwide panic over the platform abetting child suicide; and a viral video showed how pedophiles were flourishing on the site.And then there was the bestiality.Thumbnail images implying human-animal sex were discovered next to children’s videos, and after an uproar, Ms. Wojcicki was obliged to call a...…Even by the nightmarish standards of the empire she oversees, Susan Wojcicki, the chief executive officer of YouTube, has had a dreadful start to 2019. During a single week in February, BuzzFeed reported that her company was running advertisements alongside anti-vaccine content; there was a nationwide panic over the platform abetting child suicide; and a viral video showed how pedophiles were flourishing on the site.And then there was the bestiality.Thumbnail images implying human-animal sex were discovered next to children’s videos, and after an uproar, Ms. Wojcicki was obliged to call a...WW…