Well we can have teachers getting fired or pregnant, can we?
The average person make 3 major career (not just employment) changes in their lives. But it would seem that you think if a teacher decides to do something different with his/her life, there is something wrong with the system.
Let's put things into perspective here.
A new college grad who decides to opt for a teaching career has at least a year more of school ahead before even applying. Should he/she make the investment, including a student teaching semester in which no other job is possible (no time), and add another ten or twenty grand to the student loan debt, then he/she may apply to a school, along with a hundred or so other applicants. Should he/she be hired, then it's time to discover just how a lot of kids have been raised. It's a matter of sink or swim in most schools, and many sink, quit teaching, go to something else. Some get jobs in small schools where their policy is to keep teachers two years, then let them go to hire cheaper new grads. Some get jobs in charter schools where they are at will employees, and where the school may or may not be in business next year.
I started a teaching career in 1966, when there was a severe shortage of teachers and you could actually work on a credential while teaching and getting a paycheck. I stayed with it until 2001, when I was able to retire with a good pension (yes, there are financial perks to teaching, and retirement is one of them).
No way would I invest the money to get a teaching credential today. Schools are run by the state now, the curriculum is test centered, and the kids could care less about the test. Nevertheless, the mindless bureaucrats in charge (MBIC) have issued the edict that every child will pass the test whether they want to or not, whether they have an IQ of 80 or 120, whether or not they just got to the US from a nation where English is not spoken and kids don't go to school, it doesn't matter, according to the MBIC, every child has to pass a difficult multiple guess test, or the teacher has failed.
I can look back on a rewarding career, but would not want to be in the trenches fighting the MBIC and the economic realities of today, no thank you, not even in a community where the gangs are not yet in charge.