Accidents can happen and we have a criminal law system that provides for incarceration of those deemed to be a danger to society. However, no form of vetting can detect those with no criminal record hence we have seen a significant number of sexual abuse cases against licensed and vetted taxi drivers over the years, the vast majority of the same being committed by white Irish by accident of birth drivers who were vetted from birth. I guess, in a lot of cases, it just comes down to a man putting himself in a situation that induces urges with which he cannot cope in a manner considered acceptable in this modern era. I wouldn't imagine the threat is any greater among unlicensed drivers but, in any event, I certainly wouldn't fear any of them myself. Maybe you believe all taxi drivers should be (chemically) castrated?
Based on my own experience in West Cork I'd take a lift of the devil himself. The motor seized in this case seems to be in very good nick, far better from a road safety perspective than a lot of the aging vehicles licensed by NTA which includes 15+YO converted cargo vans, FFS!