While I do not deny there may be legal grounds for the charges, the article did not indicate such. WHATEVER HAPPENED TO COMMON SENSE!
Like people in all walks of life, there are those willing to advance their personal or political agendas by misusing their positions and authority, lawyers included. Education or position does not make one just or wise. While the letter of the law may be perfect, the exercise and execution is definitely not.
"explaining why they were so heavily armed in their workshop -- "
None of your business.
"did they 'always' have such guns around, for example?"
I certainly hope so.
None of your business.
It's the law's business because laying in wait and then executing a burglar is illegal -- and that's what the facts suggest.