Should violent criminals be castrated?

[Nobody]

Then why don't you demonstrate its foolishness instead of just calling it so?

Because the foolish comment and perspective demonstrates itself so all on it's own.
Anyone who calls violent crimes, like murder and rape, 'transient offenses', and then equates shoplifting to be on the same level is someone who is too young to enter into a legitimate debate regarding criminal justice. Or, they're someone who should be watched! Because they're one of those we're talking about.

Rape and murder are transient offenses?
Tell that to the victims and the surviving family members. It's an absurd, even obscene, dismissal of the impact such violence exacts not only and obviously upon the victim, but the surviving family members. And also, the rest of society if that type of offender is let out into the public domain.

Whether they have their manhood in tact or not.

And by the way, if we're asking such a question as that posed in the OP, why is it a sexist focus?

What would be the suggestion for women who commit such egregious offenses?
It's not like they're not out there, as one Jodi Arias on trial right now in Arizona proves!