Rashi is most notable to me for having been involved in Jewish Christian polemics.

He encouraged the purposeful forgoing of the interpretations of the ancient sages just to make Christians seem as if they were wrong.

Note: Jews did not change, or corrupt, the Tanakh but they did change their interpretations.

Note the following from Maurice Liber’s book also entitled, “Rashi”:

The Church, it is well known, transformed chiefly the Psalms into predictions of Christianity.
In order to ward off such an interpretation and not to expose themselves to criticism, many Jewish exegetes gave up that explanation of the Psalms by which they are held to be proclamations of the Messianic era, and would see in them allusions only to historic facts. Rashi followed this tendency…
For instance, he formally states: “Our masters apply this passage to the Messiah; but in order to refute the Minim, it is better to apply it to David.”

For context: Rashi was commenting on Psalm 21. Clearly, aware of ancient tradition Rashi, and those who follow his lead, purposefully change the interpretation solely in order to refute the minim (sectarian, generally a reference to Christians).

aDios,
Mariano