Questions & Answers about Keşke bu karar bizi hiç ilgilendirmese.
How does the verb ilgilenmek (to be interested) change meaning here?
It uses the causative suffix -dir to become ilgilendirmek. While ilgilenmek means "to be interested in" or "to deal with" (usually taking the postposition ile), making it causative changes the meaning to "to interest someone" or "to concern someone". This is why it takes the direct accusative object bizi (us) rather than a postposition.
Why is the verb conjugated with the conditional suffix -se?
The word keşke (I wish / if only) is almost always paired with the conditional suffix (-sa / -se) to express a hypothetical situation or a strong wish. Together, keşke ... -se conveys "I wish that [something] would/would not happen."
Does this sentence express a wish about the past or the present?
It expresses a wish about the present or a general, ongoing situation ("I wish it didn't concern us"). If you wanted to express regret about the past ("I wish it hadn't concerned us"), you would need to combine the conditional and past tense suffixes to form the unreal past: ilgilendirmeseydi.
How does hiç affect the meaning of the sentence?