This is true of other vices as well. Many have argued that legalized sex work will decrease the amount of human trafficking, when reality has shown it actually increases it.
I'd really like to see an in-depth analysis of multiple such cases of ... what to call it? Vice permissivity? And what effects stack up.
I strongly suspect that one element of legalisation is that it normalises the activity, which lowers all sorts of social and psychological barriers to participation.
Another is that it creates self-organised self-interest groups. This is actually a really great way to ensure the longevity of governmental programmes, with both positive and negative examples: welfare systems such as Social Security, Medicare, and the ACA in the US are all immensely popular with the elderly, a staunch voting block, to the extent that its general trend toward conservativism doesn't fully mute interest in social welfare. The military-industrial complex is another, and a recent discussion I'd heard of the Inflation Reduction Act highlighted the constituencies built in to support it even in deep-red southern US states.
In the case of legalisation of gambling, drugs, and sex work, what had previously been the purview of criminal gangs now becomes "ordinary business" (though the thought occurs that the distinction between the two may be less than is commonly understood). To the extent that established businesses prove to be highly effective at defending even the most indefensible of practices (tobacco, alcohol, asbestos, lead, plastics, fossil fuels) is well established, and the risks of that path should be strongly considered.
Another option is to decriminalise rather than legalise a practice, but focus on policing the most problematic elements of the practice. That might be the provider side (as with drugs and gambling) or the consumer side (as with sex work, targeting johns), or on going up-market and tightly limiting or prohibiting private aggregators (e.g., pimps, drug lords) rather than focusing on low-level actors (streetwalkers, individual workers, street crews within drug operations).
State-operated operations (gambling, lotteries, alcohol and tobacco sales, drug distribution *with integrated treatment), is another option, though it too isn't a surefire solution. My view is that lottery programmes in the US are out of control and a net negative, though in part that itself reflects the public-private partnership in the operation of many of these.
The problem with legalized sex work is that when a cop is faced with a human trafficking victim, there is nothing he can do if the trafficking victim does not testify and explicitly ask for police intervention, which is a high bar to clear for a victim that would at best become homeless in a foreign country and at worst receive severe repercussions for an escape attempt.
The solution to this problem would be mandatory sex worker licenses and mandatory yearly counseling that acts as an escape path for trafficking victims.
There are three frameworks of legalisation in Australia, none of which ban the selling of sex, all of which limit or criminalise brothels and forms of "organised prostition by third parties".
There are many women police officers in vice and many means with which to tackle sex trafficking, with or without the testimony of specific victims (bearing in mind that sex trafficking almost always involves many victims).
Yearly contact seems ... sparse... there's more sense to be had in mandatory weekly or fortnightly STI checkups, etc. which incorporates contact with trained medical professionals familiar with the ins and outs of te game.
Huh TIL that the usa taxes gambling winnings, and that you can offset with losses up to the amount of winnings (https://www.irs.gov/taxtopics/tc419)
Guess it's good my luck was terrible in Vegas or I might've inadvertently committed tax fraud. Though now I'm curious if I had won a few hundred dollars would there have been tax due?
In the UK you can choose to pay tax on your stake when you place it, so that your winnings are tax free, or not, in which case your winnings are taxed.
Are you sure? I never make bets over £20 or so, but my understanding is if I hit it big there's no tax to worry about - this source seems to agree, unless you're a professional gambler which somewhat makes sense https://intelligentodds.com/gambling/do-you-pay-tax-on-gambl...