In the Hebrew text, Ps. 89:37 is what the KJV calls Ps. 89:36. If you look at the Hebrew "Ps. 89:38" you'll see KJV 37 and the term yikkun olam. The root kun is most often translated prepare or establish, and the Jewish notion included older English "fix", meaning establish or set firmly, but has migrated into the newer meaning of "fix" that focuses on healing breaches as a subset of that. Olam refers to any spacetime cosmic system and so can mean world, age, cosmos, or forever, but has the same concept cluster of preparing the whole world, eternally or for eternity.

Obviously Ethan, the psalmist, says literally that tikkun olam cannot happen without David's seed being the one established forever. The greater concept is that this Messianic establishment forever informs the establishment of the whole world in its time.

There is some Rabbinical manipulation of this concept that puts it more in the hands of other humans without direct reference to the Messianic work, and in comparative religion this is identical to Christian manipulation of dominionism that purports to put the Messianic work in Christian hands without significant reference to Christ's part in it (and in Islam it's even bolder). That is indeed to be lamented in both religions, but it's not as if every Jewish man, woman, and child has a theology of getting their fingers into the whole world without reference to God's will. The thing OP complains about is just a wing that seizes upon a balanced Scriptural concept and imbalances it.

In short, to criticize the Jews more accurately one must learn that a subset of Rabbinism has hijacked the covenant and Christian principle that our brother Ethan described with the verbal form of the noun tikkun olam. The assumption that this is related to Moloch is entirely inaccurate and external and has nothing to do with learning how to criticize more accurately.

Shortsighted.

Established forever without healing?