下手に出る '(to) come out humbly / take a humble stance' is the idiomatic phrase for 'taking a low posture / being deferential,' the opposite of 強気に出る 'take a firm stance.' ばかりもなんだし '(being) nothing but X is also (not quite right) and...' — where なんだ is the indirect 'it's something' that stands in for a vague negative assessment ('a bit of a problem,' 'not ideal'). かつ 'furthermore / also' is a formal conjunction. 倫理的 'ethical' uses the ~的 suffix.