Why might the action of the Seljuk's in conquering Southwest Asia have ignited the Christian Crusades?

The Seljuk Turks' conquest of Southwest Asia, particularly their control over key regions such as Jerusalem, threatened Christian access to holy sites, prompting fears among European Christians. Their expansion into Byzantine territories also destabilized the region and contributed to a call for military intervention. Additionally, Pope Urban II's call for the First Crusade in 1095 was partly motivated by a desire to reclaim the Holy Land and unite Christendom against a common enemy, thus igniting widespread support for the Crusades.