The bigger question is why were ANY let go and not deported immediately. CIS is not "Anti-immigrant" as you put it, they ARE however anti-ILLEGAL immigrant. Big difference there.
These people are not 'immigrants' the are illegal immigrants who broke the law the minute they crossed our border, i.e. they don't have a right to be here. Period.
I don't know what they do Uruguay, and frankly I don't care, but here it is supposed to be illegal to cross the border with no passport and not use a Port of Entry. Because Obummer refuses to enforce the laws does not mean they cease to exist.
You can parse the numbers all you want, even ICE admits that a significant number were released, some of them murderers.
"ICE spokeswoman Barbara Gonzalez said the report misses the fact that many of the releases were carried out under orders from U.S. courts. For example, she said 75% of the people released who had murder convictions were "mandatory releases."
Exactly how is there any 'mandatory release' for a convicted killer? And why if they MUST be released are they not sent directly back to their country of origin?
Go back to school, learn something.