I don't think Q is doing this for evil purposes. He's willing to make a point that causes death though e.g. the Enterprise crew members who died in 'Q Who', and what happened to Elnor in 'Assimilation'. John de Lancie called him a 'catalyst' this season.
A couple other wrinkles: in DS9's 'Q-Less' he hinted at what was wrong but didn't interfere. He has acted as tempter/guide when ordered by the Continuum e.g, 'Hide and Q', 'True Q', 'All Good Things', 'Death Wish' and 'The Q and the Grey'. But he also goes rogue, as in 'Qpid', 'Tapestry', 'Q2', and seemingly, in Picard, season 2.
And there are sometimes consequences for his actions re: 'Deja Q' and, apparently, 'Watcher'.
He summed himself up perfectly when Adam Soong asked him who is was in 'Fly Me to the Moon':
"I am the evolution of stardust. I am the gentle flutter of a butterfly. I am death, destroyer of worlds."
A couple other wrinkles: in DS9's 'Q-Less' he hinted at what was wrong but didn't interfere. He has acted as tempter/guide when ordered by the Continuum e.g, 'Hide and Q', 'True Q', 'All Good Things', 'Death Wish' and 'The Q and the Grey'. But he also goes rogue, as in 'Qpid', 'Tapestry', 'Q2', and seemingly, in Picard, season 2.
And there are sometimes consequences for his actions re: 'Deja Q' and, apparently, 'Watcher'.
He summed himself up perfectly when Adam Soong asked him who is was in 'Fly Me to the Moon':
"I am the evolution of stardust. I am the gentle flutter of a butterfly. I am death, destroyer of worlds."