This particular constitutional violation was against an individual not permitted to own firearms. Non-citizens would be the least risky group to target for home invasions for this reason.
So, firearms are off the table for that person. How about alternatives that aren't gunpowder based (bows, crossbows, creative mantraps, etc)? :)
So the man may have still been dangerous. People who own firearms legally are the less dangerous than those who possess them illegally. Although it's not clear what type of dangerous weapon the man had.
Below the section you chose to quote:
‘Court records indicate Gibson’s legal history shows only the one felony in 2008 (later dismissed by the court), along with a few traffic violations, minor drug arrests and an arrest for riding public transportation without paying the fare.’