It depends on who you ask. If you ask teachers, they'll tell you that they work 16 hours work days all year long, but try scheduling a teacher-parent meeting after work hours.

Its almost as if they are also humans who need to feed and enjoy themselves outside their job.

I know a few american teachers, grade thru hs. They report wages and supplies are a bit better off than in previous years, but that cricculum is so perscribed that they feel little leeway to actually 'teach'. They find themselves optimising for test taking and hate themselves a little bit for it. They are constantly under fire from other teachers with competing agendas, and beset by often abusive, sometimes nessarry, unions. It is a bad system that has evolved and the teachers are sad pawns in it. But there is still live to live, love to explore and things to strive for outside your job. Teachers have a heavy feeling of seeing their enforced ineffectiveness slowly degrade their community.

But screw teachers for not having extra time, amirite?

Wait, are you saying that being resistant to schedule work which both is recognized as appropriate for official working hours by the employer and which can be effectively performed during that time given the structure of the working day somehow contradicts the claim of necessary work that either cannot effectively be done during the official working day or is not recognized as necessary by the employer that must, therefore, be done outside that time?

Because from where I sit those don't conflict at all.