The education of the teacher is one of the major components of the Finnish system. They are highly educated and the standards are rigorous to become a teacher. Just as one entrusts their health with a Doctor of the highest quality, the same regard is given to the teacher.
I hear exactly what your wife is saying about some of her colleagues. I've seen teachers in elementary school that aren't qualified enough work in a daycare, yet they are the main teacher for a child for their entire school year. My favorite thing is when our boys bring home their graded homework and the teacher has marked that an was wrong, yet the answer was actually corerct or conversely when there is an answer that is clearly wrong, yet marked as correct. We've had teachers that couldn't do their possessives if their livelihood was on the line.
Their school system does extensive work with bullying and the concept in theory is terrific. In implementation, it's a joke. So they have a no tolerance policy and the kids are supposed to report the kids that are bullying. OK, the kids do that and the teachers simply tell them things along the lines of "Johnny has certain developmental issues, or this problem, issues at home, etc." and nothing is ever solved. It's as if they foster even greater bullying because they have a whole campaign against it, which the bully is fully aware of, and there are absolutely no teeth behind the policy. The bully then knows that they can do as they please because there is virtually never a true punishment for their abhorrent behavior.