Often, I've tried showing what happens when data quality is poor by using other industries (NASA, aviation, etc.). I've often gotten the response, "Well, we ain't building airplanes here!" So, showing them data within their own organization and speaking their language (financials). "Customer complaints cost us 10% of revenue last quarter due to this issue which our data says isn't an issue." The contradiction and the cost get leadership's and decision-makers' attention very quickly.