Congress passed the law for good and prudent reason, seeing the abuses caused by having the military acting as law enforcement during the Reconstruction period. The American Revolution was partly caused by British troops trying to act in a law enforcement capacity
The frame of mind that makes for a good soldier generally makes for a bad cop. Something to keep in mind as our police forces become increasingly militarized
"The frame of mind that makes for a good soldier generally makes for a bad cop."
The issue here is whether the federal military or the state military makes a better cop. The NG is no better trained to be a police force than the federal forces.
"Something to keep in mind as our police forces become increasingly militarized"
The militarization of local police forces is also a separate issues.
The point I was making is really this. There were a number of complaints on this thread that repealing or amending Posse Comitatus was unconstitutional. There is a difference between a law and an article of the constitution.