Some of these articles are just generic bashing of school choice, and not relevant to the discussion about whether charter schools reject or push out more challenging students.
e.g. the last article is about Arizona's ESAs, which compete with charter schools.
I'd say the conservatives in AZ are transitioning AZ to ESAs over charters because it lets them fund religious education more easily and with less oversight, does away with the equal access fiction behind charters, and is a way to mess with budgets.
e.g. the last article is about Arizona's ESAs, which compete with charter schools.