‘Let Him Go’: Lane and Costner embrace this effective 20th century western

“Let Him Go” – “You let it be known, you’re looking for a Weboy, they’ll find you.” The last time that we saw Diane Lane and Kevin Costner on the big screen together, they played Superman’s parents, Martha and Jonathan Kent, in “Man of Steel” (2013), and in director/writer Thomas Bezucha’s “Let Him Go”, they portray a caring mom and dad as well.  Margaret and George Blackledge (Lane, Costner) don’t live in Smallville.  They reside in Montana. For many years, Margaret broke horses, and George – a long-time lawman –…