They had plenty of motive to remove him. He is basically Tucker Carlson Lite, but his audience is enormous, and he was impossible to paint as a 'crank.' He was 'normalizing' questioning Israel much more effectively than anyone because he was so much more normie coded than Tucker, Fuentes, et al. Mossad shrewdly saw him as more dangerous for this reason.

There is the term 'hiding your power level.' In order to have the massive platform he had, Kirk had to toe the pro-Israel line 80% of the time. but he became increasingly more 'based' as time went on.

Similar to Tucker Carlson, who says ever more radical things each year, as the Overton Window permits, while often couching it in mainstream conservative coding to maintain access to the mainstream, where he can be most influential.