What it means
にあたらない is a formal expression meaning that an action is not worth doing, is unnecessary, or is not warranted. It attaches to a verb in the dictionary form or directly to a noun. With a verb, it often rejects an excessive reaction, as in saying that something is not worth worrying about, blaming, or being surprised by. With a noun, it states that something does not merit a particular evaluation or response. The expression is common in formal writing, official statements, and measured explanations.
Usage note
にあたらない can also be written as に当たらない. Do not confuse this grammatical use with the literal negative of 当たる, meaning that something does not hit, correspond, or apply. The polite counterpart is にあたりません.
How to use it
その発言は非難にあたりません。
That remark does not warrant condemnation.
彼の判断を責めるにあたりません。
There is no need to blame his decision.
その発言は非難にあたらない。
That remark does not warrant condemnation.
彼の判断を責めるにあたらない。
There is no need to blame his decision.