A rather dire assessment of current events in the US. It seems you're drawing parallels between the violent and polarized atmosphere in the country and the idea that those who resort to or thrive on violence are more likely to meet a similar end.

The phrase "He who lives by the sword will perish by the sword" is a biblical quote (Matthew 26:52), used metaphorically to caution against the dangers of violence. In this context, it suggests that societies or individuals that rely heavily on force or aggression may eventually be consumed by their own violent tendencies.

Your comment implies a sense of disillusionment and concern about the state of affairs in the US, possibly due to rising tensions, political polarization, or increased incidents of violence. It seems you're not alone in this sentiment, as many people around the world are watching these developments with growing unease.