do you think twitters and others ban of trump a good move in a democratic society or is it a justified move to silence a dangerous man? 

Trump is an anti-American terrorist who committed sedition against the United States and directed an armed assault on the Capitol. His actions led directly to the death of five Americans including a police officer. 
In less tolerant times, Trump would’ve already been pulled out of the White House and hung from a tree or decapitated. 
If this whole issue of “private company censoring free speech” bothers you, then just imagine Twitter is a local bakery and Trump is a gay couple wanting to buy a cake. If it was okay to deny that gay couple of their rights, then it is certainly okay to deny a mass murdering seditionist of his right to use the services of a private company to spread hate and lies.   

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