The fact that the knife was allegedly the property of Fr. Robinson means nothing. Any clever murderer who wanted to hurt the Church would naturally steal the weapon and return in it to it's owner after doing the dirty deed.What could be easier and more in keeping with an evil objective than a priest whose office was close to the chapel. On the other hand,we don't know anything about Father either,nor can we begin to realize how many holy people may have been under an evil supernatural influence in the 70's and 80's especially.
In a way,we should be grateful that it has resurfaced now rather than remaining unsolved and simmering. We may learn much more about what evil lurks close to the Church from this case than from the sexually abused minors. For that let us pray. And we should also pray earnestly for Father Robinson,who,no matter the case needs our prayers.