it is not considered comme il faut to venture that these things also suggest that perhaps there really is a loose but genuine correlation between being poor and being actually less intellectually capable.
Of course, like all generalisations, this one is dangerous. Plenty of people are bright but poor, and the right agrees with the left on this, even if it signals its agreement with an unremitting focus on grammar schools. Plenty of people are rich and stupid as well, which presumably is why they cannot see that their focus on grammar schools is a focus on helping the most capable the most, and therefore the least capable the least.