BMass goes on to tackle the 'inevitability' argument, quite convincingly. He also asks people to take up this issue at Democratic Party Platform meetings, which can be found here.
First, though gambling is taking place in other states and the lottery, this would be a massive expansion of the most addictive form which would put as many as 5% of the Massachusetts population at risk of new compulsive behaviors. That's as many as 300,000 people - if not you, then potentially your parents, your neighbors, and your kids. In any case, the argument that "two wrongs DO make a right" -- i.e. that if something bad is happening somewhere else we might as well encourage more of it here -- is morally and politically confused.
Second, if the the neurological studies don't convince you that there is a problem, maybe the terms that slot machine manufacturers and casino use will give you some insight. They both work tirelessly to increase a person's "time on device" in order to get a person to "play to extinction" (i.e. exhaust their bank accounts). Some otherwise healthy adults wear adult diapers so they don't have to leave a "hot" machine.
I added an addendum to the post in the form of a comment, one that I think is important enough to include here.
Senator Tucker made an eloquent point at last year's slot hearing. It was one of the most passionate, moving speeches I've ever seen given at a hearing of any kind before. Senator Tucker said that there are four basic tests that we need to consider before passing any sort of tax. Slot machines fail all four:
1. They're volatile. You never know what you'll get in a year, which means your budget is at the constant mercy of the casino lobby.We need to seek stable streams of revenue that are efficient and fair to collect, that don't leech off of other industries that we tax within this state. There are mature and responsible ways of doing that -- but slot machines aren't one of them.
2. They're unfair. They prey on those who can least afford to pay it.
3. They're expensive to collect. We'd need to build a whole new bureaucratic gambling authority to oversee this mammoth new project. Folks, if you like the Turnpike Authority, you'll love the Gambling one. (Not to mention the huge cost and toll this will take on services within the state, from police to addiction counseling.)
4. It doesn't create new revenue. A slot parlor or casino is largely just a redistribution of the local economy. It's money going from local businesses to the Casino Borg. Instead of having local money have a ripple effect, it becomes money your local community will never see again. This isn't just a tax on users, but on the very local businesses that are the foundation of our cities and towns.