Yes upon release for all offenders
Yes upon release for non-violent offenders and never for violent offenders
Yes upon releases for non-violent offenders and a certain amount of time for violent offenses.
Yes after 1-5 years
Yes after 6-10 years
Yes after 11-15 years
Yes after 16-20 years
Yes after 21-30 years
Yes but time of record deletion should depend on offense.
Criminal records should never be erased.
Your position is not well balanced.
I can agree conditionally to this concept to a certain degree within the current system, perhaps with the most minor offenses. However, I would personally prefer to see an across the board de criminalization of non-violent crimes. By this I mean that instead of property crimes and non-violent traffic crimes receiving jail time you enhance the duration of punishment but instead require community service (a conviction that might call for 30 days in jail would be converted to 60 days of community service). Multiple offenses could further increase the duration of service, and perhaps a "three strikes" type rule be imposed on repeat offenders. This would reduce the burden on the prison system and with prisons primarily being filled with malicious criminals there will be less demand for "prisoners rights" and we can cut costly amenities that the law-abiding poor cant even afford for themselves. And we'd get low cost labor to help the community in basic beautification and maintenance projects.
Absolutely not, just like a credit history your criminal past indicates your future behavior
However, on the hackers thing, there's a range of thought on the issue. Symantec used to hire old virus/trojan writers to help them write the code for detection of new viruses/trojans in the wild. McAfee would not. That's why, during those years McAfee yanked goats and symantec was more effective (at actual detection).
"A nation can survive its fools, and even the ambitious. But it cannot survive treason from within. An enemy at the gates is less formidable, for he is known and carries his banner openly. But the traitor moves amongst those within the gate freely, his sly whispers rustling through all the alleys, heard in the very halls of government itself. For the traitor appears not a traitor; he speaks in accents familiar to his victims, and he wears their face and their arguments, he appeals to the baseness that lies deep in the hearts of all men. He rots the soul of a nation, he works secretly and unknown in the night to undermine the pillars of the city, he infects the body politic so that it can no longer resist. A murder is less to fear"
Cicero Marcus Tullius