I think I've figured out why creationists love the notion of teaching the "strengths and weaknesses" of evolution, it's because if you just teach evolution then those weaknesses don't come out. So instead of having a public that's educated about the topic, there's a host of creationists who have a fundamental misunderstanding of what evolution is and just engage in apologetics on talking points they have been told invalidate evolution. I've found myself time and time again answering the same fallacious objections only to find that the person raising them has no clue as to what they actually mean.
From the outsider perspective, it's actually funny reading creationist lesson plans. Because right there they have the chance to give the children a proper education in what evolution is even if they don't have to believe it, and instead they give a whole bunch of reasons that evolution couldn't work. Surely if evolution was as broken as the creationists make it out to be then a proper education on the subject matter would make those objections glare out. But no, it doesn't work that way. They have to highlight just what is wrong with evolution instead of affording the child to think about the concept and find those errors themselves.
One would be inclined to think that the reason they take this approach is because the case for evolution is so strong. It's an unconscious admission of the apparent validity of evolution because the only way they can teach it is to lie to children about it in the hope that those children won't learn any better.