Unions make employees feel they are "entitled" to compensation increases regardless of company performance.

My local teachers union, already the highest paid teachers in the state, went on strike following the 2001 recession when tons of students' parents had been laid off and couldn't find jobs (ie. the real world). These teachers now get paid around $105K + a ~$25K PPO plan, after 8 years teaching + a masters. Just sickening.