In what ways should the United States be concerned of how the world views its use of the death penalty?

In what ways should the United States be concerned of how the world views its use of the death penalty? Consider the following article from the Death Penalty Information Center https://deathpenaltyinfo.org/facts-and-research/dpic-reports/international-perspectives-on-the-death-penalty-a-costly-isolation-for-the-u-s