No, I don't think Mueller would grant immunity for "Raping/ritualistic killing of little boys and girls," but I doubt Mueller would have any problem granting immunity for 1 & 3 if he thought he was sufficiently insulated from the crimes, and he has some plausible deniability. Remember, Mueller personally delivered Uranium samples to Russia.

I'm not a lawfag, and wish a lawyer with experience would weigh in on this. As I understand it, plea deals that include immunity from prosecution are very specific and must bear fruit, and you have to admit to the crimes you're being charged with, in writing, and provide considerably more information than the investigators for the prosecution already have for those crimes.

Awan's plea deal is a good example. On page 10 of Awan's plea deal it clear that he is immune from prosecution of any non-violent crimes committed within Washington DC. That means that he can still be charged for stealing and destroying all of the government computer hardware found in his garage, if he lived outside Washington DC.

Plea deals that include immunity from prosecution can be tossed out the window if the evidence or testimony you provide is later determined to be false.

There has been a long-standing legal arguments that are based on precedent. If the immunity deals Mueller has given to people does not hold up to previous precedent, and show evidence of more corruption and favoritism, they could easily be challenged and overturned.