Before revision: Because many newsworthy events have two or more opposing camps making competing claims, news media is responsible for reporting all (credible or reasonable) opposing positions, along with verified facts that may support one or the other side of an issue.
After revision: Because many newsworthy events have two or more opposing camps making competing claims, news media are responsible for reporting all (credible or reasonable) opposing positions, along with verified facts that may support one or the other side of an issue.