In Canada, we take apologizing very seriously. So it pains me to see people & corporate entities erroneously apologizing when there is nothing to apologize for.
Apologies aren't something you casually toss away in an attempt to absolve yourself of any wrongdoing. An apology is a heartfelt acknowledgment of a mistake, and the intent to not repeat it in the future. When nothing happened that requires an apology, but you apologize anyway, it diminishes the sincerity of actual apologies.
I hope that Riot learns from this and does not repeat this mistake. Kai'sa is fine. There is no need to apologize.
A concerned Canadian.