Well, do you think a teacher can love a class of 20 or 30 kids, like a parent can? I think they might do a professional job, but it would be impossible to give individual attention. And, around here (UK), teachers have a lot of non class time obligations with the result being that they are away and a lot of care is passed to teaching assistants.
A teacher with 20-30 kids under watch cannot give the same level of attention to each child as a parent with 1-3 kids under watch, all else equal, but are attention and love the same thing?