I don't think laziness is the root cause of bad unit testing. For my company, time constraints and "just get it done" attitude are the biggest deterrents for doing unit testing. Also, the places where our systems fail tend to be more at the integration level (services, database accesses, complex queries that require specific data for testing), not the "unit level." These things are just harder to test, and if you barely have enough time to get the feature done, you're probably not going to have time to get any useful tests done at the same time.
