Everyone had different aims, and that naturally included Dumbledore, Grindelwald, and Anton.
As a moderate, Dumbledore was willing to compromise and accept Voldemort joining them, because he knew that a wizarding society full of nothing but kind people wasn't necessarily the best kind.
In the end, some people had to speak up and shout a few words. Whether those cries were good or bad, they would ultimately benefit wizarding society as a whole.
After all...
Wizards were creatures driven by their emotions and feelings, and in essence, they weren't entirely benevolent toward Muggles.
Now that wizards' Magic had shown its good side through cooperation in technology, daily life, and other areas, the darker side would eventually emerge as well.
The fact that Counter-Curses had been developed for the three Unforgivable Curses—mind control, killing, and torture—didn't mean anything. Those curses didn't define wizards as a whole.
Nor could wizards completely ban such things just because they wanted to live in harmony with Muggles.
Of course, they could completely abolish the three Unforgivable Curses, or even make the Wizarding World forget all about them. But then, should they also forget Felix Felicis, which could undermine fairness? What about the Dancing Charm, Transfiguration, the Engorgement and Shrinking Charms, and other spells that could have a huge impact on densely populated Muggle residential areas, such as high-rise buildings? Should those be forgotten too?
Wizards couldn't keep castrating themselves like this forever.
Survival through negotiation wasn't just a matter of dealing with Muggles. It also applied to the International Confederation of Wizards and the Magical Congress.
Their relationship should be complex, a case of 'you in me, and me in you.'
Grindelwald was different. He wanted the International Statute of Wizarding Secrecy to leave a loophole big enough to strike back at Muggle society.
He