I do believe that +Thuc was a good and holy man, and the good he did to preserve the Faith during this Crisis outweighs his mistakes. It’s just that the Church does sometimes withhold canonization over mistakes of this nature. Of course, anyone can make a mistake. St. Cyprian strongly promoted the notion of rebaptizing heretics that was later condemned as heretical, St. Vincent Ferrer sided with an Antipope, St. Thomas got it wrong about The Immaculate Conception, etc. etc.