The Virtuoso

The coded note The Virtuoso receives at the start of the film reads:

"Once there was a worn and withered old man too set in his ways, bound by routine to have the fore-sight to understand that in all his seventy-six years he's always done the same thing, ate the same food, chose the same colors, won the same battles. His life a breathing pentagon: home, work, rest, eat, dream. From age eighteen he'd never questioned his lot. Until, the trinity... and the agony of realization that a life lived can never be re-lived."

The virtuoso is so careful, yet when he poisons the man in the motel he takes off his gloves when handling the glass. Which would leave obvious fingerprints.