I don't see what previous convictions have to do with going on this game show. Yes he did something awful but let's not tarnish him for the rest of his life. Social inequality and deprivation is one of the reasons for the high re-offending rate in this country.
If, for example, he was a convicted paedophile and said he was going to spend his winnings on a harem of underage kids to have sex with, it might be a different situation. Having £1m in the bank doesn't make him any more or less likely to assault somebody.