kids’ hearts”.Nursery staff, parents, and councillors in Renfrew have hit out at yobs who are understood to have deliberately set a bin on fire right next to the wooden castle in Robertson Park play area, which has been open throughout lockdown.The blaze has badly damaged the unique structure - part of a £1million upgrade to the park in 2017 - which has now been fenced off to youngsters.Police have said they will be carrying out extra patrols in the park in the coming days.Gemma Williams,