I have no problem with it, until said tradesman also collect social security disability, food stamps, Obama phones, etc while they’re working this underground economy.
Recent reports find EBT cards being used at HI and Las Vegas resorts and on cruises. So you know the users are working underground and not declaring income.
Most people who are honestly working 40 hour weeks can't afford to gamble in Vegas, go to HI, or take cruises.
But there has always been an underground economy (which grows as taxes grow) and always will be. And there will always be people who will mooch off the gubmint system. You have to attack the problem from the mooching end.