The Issue: Prosecutors reduce charges against a man arrested in the snowball-fight attack on NYPD officers. Manhattan’s District Attorney Alvin Bragg should have this thug give a public and heartfelt apology to the police officers he injured with snowballs ( “ ‘Kid’ you not, sir,” Feb. 27). It is especially important that the public’s belief in safety is preserved. Thomas Birnbaum Manhattan The mayor said it was nothing but a snowball fight. Now the disgraceful District Attorney’s Office has