I didn't say you should intend to break ribs, maybe my wording could be better and I'll correct it, but most people are too afraid and don't apply nearly enough force

"about 30% of patients will find themselves with a broken sternum or a fractured rib. In some cases, multiple ribs will be broken but once again this should be considered absolutely normal"

https://www.procpr.org/blog/training/hear-ribs-break-cpr