Don't use dikes to cut the remainder off. An electrician showed me a trick: If you take a pair of regular pliers, grab close to the "buckle" part and twist off, it will stretch the tie and when it snaps the end goes back inside the buckle. No more razor sharp edge.
You obviously have better quality ties than I do..... I am almost certain.... mine will break if I try that...... some more of the made in china cr@p I am sure.....