This is the reason why we classify them as FOREIGN workers. Their main purpose is to come here to earn a living and remit money back to their homeland. So they won't put their soul and heart into the job. As long as they can complete a job, get their pay, that's MISSION COMPLETE.
Our own workers are different. They are Singaporeans, went through proper training, formed Quality Control Circles and have proper assessments for promotions and pay increases. At least chances are there. FOREIGN workers ??
probably not so lucky. So what happen ? They slacked eventually. Who suffers ?? Of course Singaporeans.