This is the natural end result of giving the president qualified immunity for acts in office. There is now no reason for them to follow the law.
None of these individuals are the president.
It's the effect of qualified immunity for non-presidents.
ICE isn't inheriting the president's qualified immunity; they have it because they're government employees. It doesn't matter if they're acting in the presidents interests or not and for state employees if they're acting in the governors interests or not.
Pardon is a very clearly enumerated power of the president so any usage of it is very clearly legal (although typically undesirable).