I agree that teachers and LEOs are underpaid. However, nurses aren't highly paid either. In some areas, they are even very underpaid. I'm a nurse in a hospital & I'm not severely underpaid, but I'm not highly paid either.I think the "who should we tip" debate is getting a little off track. Teachers, police, nurses, doctors are salaried employees not in a tipping based industry. (Although I feel teachers/police deserve higher salaries).
I could move, travel or work strikes & make a six figure income, but that's not conducive to my family's lifestyle right now. That's my choice. Just like others choose their employment based on their skill set & lifestyle needs.