That is against my principles.
私の主義に反する
That is all the more reason to do ....
だからこそなおさら…すべきだ
That is another matter [thing].
それはまた別の話だ
That is because ....
それは…だからだ
That is largely incorrect.
それはほとんど間違っている
That is my opinion.
それが私の考えだ
That is my own affair.
私個人の問題だ
That is not necessarily an important factor.
それは必ずしも重要な要因ではない
That is not the case.
それは事実ではない
That is outside [within] the province of the police.
それは警察の職権外［内］だ
