Yeah, exactly. I've never heard of anyone shooting up their AI lab. Which tells me they don't believe their AI is at all likely to wipe us all out.
Unless, of course, they work for the military and are convinced that they need their AI to combat against 's AI capabilities. We already have that on drone level, and it will expand further.
And to put it more generally, a single research might think that their actions will not matter that much. Someone else will do it anyway. In a not so dissimilar way how we, on a personal level, avoid combating climate change, as "it wouldn't make a difference anyway".