It is impossible to attain wrong mindfulness and wrong concentration.

It is impossible to attain wrong mindfulness and wrong concentration. Because the uddhacca-cetasika (restlessness-mind-factor) arises with every unwholesome-mind, such as diṭṭhi-mind. This mind factor is the enemy of the main keyword of achievement, ekaggatā-cetasika (concentration-mind-factor). See the path of purification samādhiniddeso pathavīkasiṇaniddeso.

This is the reason that why in tipitaka the effects of unwholesome-minds have shorter period than the effects of wholesome-minds. And This is the reason that why the wholesome-minds have more mind factors than the unwholesome-minds.

Saddhā Included Disprovable Truth, So Kālāmasutta Excluded "Trust In (Real) Rationalist Teacher"

And trust, in kamma+vipāka (causes and effects), is used to prove "the teacher is rationalist". Because people maybe have not enough ability to prove someone, ability, that better than their ability. So disprovable truth, such as the better ability person, is excluded in kālāmasutta.

So when people enlighten as sotāpanna, they must will never have any micchādiṭṭhi, that is wrong causes or wrong effects flavor, any more. And they also have a perfect, unchangable, trust in buddha and saṅghā, who are the real rationalists.