I just don't see how a criminal conviction has a bearing on your ability to do a given job. Unless the conviction is serious (fraud, violence) and recent, I don't think it should be reportable.
As an aside, I read an article little while back that the average American (US) commits around three crimes a day, mostly without realising it. The statistic is probably similar in most western style democracies. And that's before we even consider intentional civil disobedience for political reasons.
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