The issue is that the catholic church covered up the abuse, and in some cases even moved offending priests to other parishes where they continued to abuse children.
Yes; school districts and teachers unions do this as well sometimes. It's an institutional problem, and a difficult institutional problem to solve. Just about every institution that works with children has dealt with the same problem--this famously bankrupted the Boy Scouts of America, for instance. And statistically, the Catholic Church has done a better job than most institutions.
