Expresses the speaker's strong feeling that just doing something is not enough or will not suffice.
Verb-dictionary form + ではすまない, い-adjective + ではすまない, な-adjective + ではすまない, Noun + ではすまない
Long explanation:
The grammar point ~ではすまない is used when the speaker strongly feels that an action or a situation is not sufficient or acceptable. The speaker feels that more needs to be done or that the situation has serious consequences.