Through three games, Washington had given up 128 yards in penalties. The Commanders more than doubled that against Dallas. To say that the Washington Commanders’ three-game losing streak has been ugly is an understatement. A poor first-half and offensive line play cost Washington the first two games of its losing streak. On Sunday, the Commanders’ (1-3) offense didn’t fare much better, and penalties proved costly in their 25-10 loss to the Dallas Cowboys (3-1). Washington was penalized 11 times for 136 yards. Through their first three games, the Commanders had 128 yards in penalties. “I think penalties killed us,” offensive…