An excellent point, JP. Here’s my $.02.
I think God in His mercy and love holds valid that which Protestant clergy do because the followers have faith, and God honours that faith, though incomplete. That might explain why they too have healings in their tradition or expression of faith. Protestants too feed the hungry, comfort the afflicted, cloth the naked etc. etc.
The catechism says it best:
818 “However, one cannot charge with the sin of the separation those who at present are born into these communities [that resulted from such separation] and in them are brought up in the faith of Christ, and the Catholic Church accepts them with respect and affection as brothers … All who have been justified by faith in Baptism are incorporated into Christ; they therefore have a right to be called Christians, and with good reason are accepted as brothers in the Lord by the children of the Catholic Church.”
http://www.kofc.org/images/1px_transparent.gifUnitatis redintegratio 3
kofc.org/publications/cis/catechism/getreftext.cfm?PartNum=1&SecNum=2&ChapNum=3&FParnum=1065&FnoteNum=272&NoteText=272%20UR%203%20%26%23167%3B%201%2E