If you let them stay, they form a state within a state of your host nation through extreme nepotism, and then practice subterfuge against the very people who let them in while trying to economically enslave them.  No nation survives an enemy within the gates.  Other groups practice nepotism as well, but that nepotism usually stops at something like creating a family business.  The Jews are entirely different.  They have a set of fake religious doctrine originating from the Pharisees that claims they're "god's chosen people" and the "goyim" are supposed to be their slaves, and that's exactly what they attempt every single time.

You see, the middle east has always been a shithole obssessed with slavery.  Even during the Roman days when white slaves held by white slave masters were big, the semites were still the biggest slave traders around.  Judaism is nothing more than an evil cult with origins from this antediluvian period.  It's no coincidence that usury is just an obfuscated form of slavery in practice.  That's just the Jew's attempt to refine his semitic-based slave trade.  It's all these people know.  They've done it for thousands of years now.

If you kick these people out of your country, like people have done over 100 different times now, they simply reorganize in a new country, infilitrate it's economy, media, and institutions, then attempt to trick their new hosts into waging war to enact revenge upon you.  They're trying to do it to Russia as we speak.  This is the basis of the so called final solution.  You have to wipe out this evil cult completely or they'll cause endless war and death for every country on the planet.