He hasn't been mourned openly because his funeral wasn't open to the congregation, and there's been no memorial service at the church apart from a short prayer service on the day his death was announced. When a loved one dies you inevitably ask why, and the lack of information leaves people feeling upset and angry, which is normal. I guess a lot of people felt personally close to him because of his position, so the institutional silence following his disappearance and death must be very painful and doesn't seem the best way of handling this tragic event.