I don't see what all the speculation is about. Black hole has such immense gravitational attraction that it crushes anything that is drawn in to it. That's gravity. The gravitational attraction of the earth keeps us rooted to the ground. What if that gravitational attraction was 10x stronger? We would die. Now imagine what would happen if that gravitational attraction was millions of times stronger? Answer should be fairly obvious.

Our entire galaxy is slowly being drawn in to the black hole at the centre. That is huge stars and solar systems. I'm sorry, but humans just don't stand a chance. I mean, you could hypothesise what's at the centre and whatnot, but any tangible interactions between humans and blackholes should be disregarded.