On average, a Texas worker is 12 percent more likely to be killed on the job than someone doing the same job elsewhere, according to a Dallas Morning News analysis of federal data. That translates to about 580 excess workplace deaths over a decade. Construction has contributed mightily to Texas’ booming economy. And the state’s construction sites are 22 percent deadlier than the national average. Government and industry here have invested relatively little in safety equipment, training and inspections, researchers say. And Texas is one of the toughest places to organize unions, which can promote safety.