I've searched them online, but still couldn't distinguish these two. I know: ①The former is to remark or to express a strong feeling. ②The later is more about personal emotion, obligation and social common sense.
There are two sentences below. ③理由はどうであれ、飲酒運転でまったのだから、罰金を払わ「ないではすまない」。⭕ ④理由はどうであれ、飲酒運転でまったのだから、罰金を払わ「ないでわではおかない」。 ❌ I know why the ③ is correct, but I don't understand why the ④ is wrong. Why can't I view the ④ as a kind of remark? So it will be correct.