Days not only established that one could easily visit the Destiny Islands, but that Riku visited the place frequently.
Despite this, he never attempts to make contact with Kairi, who has been worried about him, and who he knows is a person at risk, on account of her being a princess of heart.
Neither does he try to help Sora in that regard, by letting him visit her or something
In KH2 it was implied that Sora didn't have the means to get to the Destiny Islands... but in reality, it seems it was very easy to access, and nobody actually cared enough about Kairi to check on her
Days not only established that one could easily visit the Destiny Islands, but that Riku visited the place frequently.
Despite this, he never attempts to make contact with Kairi, who has been worried about him, and who he knows is a person at risk, on account of her being a princess of heart.
Neither does he try to help Sora in that regard, by letting him visit her or something
In KH2 it was implied that Sora didn't have the means to get to the Destiny Islands... but in reality, it seems it was very easy to access, and nobody actually cared enough about Kairi to check on her