Susuto

Josephus records that Herod did good stuff and bad stuff including:

-had three of his sons executed for conspiracy
-executed his brother-in-law, Joseph
-at the urging of Joseph’s widow, Salome, he murdered his own wife, Mariamme
-murdered the Jewish High Priest, Aristobolus III (his brother-in-law)

and just to show he wasn’t just a Family Guy
-murdered forty five members of the Sanhedrin for their support of the Hasmoneans.

Josephus did not know or record all of Herod’s deeds.
But he seems quite capable of committing the crime Matthew alleges,
http://en.wikipedia.org/wiki/Herod_the_Great

BTW note the double standard used by some in assessing ancient history eg non-Christian sources for life of Jesus (ultra-skeptical) vs eg Herod (uncritically accepted). Josephus had not met either Herod or Jesus. Josephus mentions Jesus twice, one of the references has probably been doctored, the other has not been.