Amanda Knox defended her comedic one-woman show, “Cartwheel,” amid criticism from murder victim Meredith Kercher‘s sister and a groundswell of social media opposition. “A petition to cancel a show no one has seen, on the grounds of false accusations intended to shame and vilify a wronged woman into silence, is not an argument against ‘Cartwheel,’” Knox, 39, wrote via Instagram on Thursday, August 6. “It’s a fairly precise description of what ‘Cartwheel’ is about and why it deserves to exist.” Knox debuts at the famed Edinburgh Festival Fringe on Friday, August 7, in a solo...