My wife was a teacher before turning to writing supplemental educational material a few years ago. A few thoughts:
Yes, teachers get a lot of time off and that makes their pay seem large. However, during the school year I'd say she averaged 60 hours per week. Lesson plans, grading, writing tests, setting up the classroom (more work than you might think), meetings, meeting with parents and/or dealing with unruly kids, writing and maintaining IEP files, writing her own curriculum (there are no perfect curriculum and teachers have to alter it or supplement it) and many other tasks aside from teaching. They have mostly lost teacher aides, lost their break times, free periods used for making copies and other administrative tasks, dealing with students who have English as their second language, ADHD students, abused students.... the list goes on and on. There is more stress than you might imagine.
Add to that a teaching credential lasts for 3-4 years. After the initial one, a teacher in most states has to obtain 1/2 of a Masters degree to get the second and the other half for the third. That's over $40,000 out of our pockets. Now that she has her credential (she needs it to keep writing), she has to pay for CE credits to renew her credential at a cost of $6,000. Aside from that she averages about $1,000 per year out of pocket for things not otherwise covered or reimbursed for the classroom. She's had her teaching credential for 14 years and we have paid almost $60,000 out of pocket for the privilege. That's over $4,000 per year. Not many other jobs require that kind of a payout.
Now, all that said, I do have to agree the retirement package is just plain sick. And most teachers can retire with a minimum of 100% pay, generous pay increase each year and 100% free and full medical benefits and can get those at age 55.
So while something may be need to be done about the retirement package, don't sell teachers short on how hard they work and how much they have to spend to keep teaching.