People are stupid.
The whole ideal of CRISPR, eugenics is problematic because it's rooted in time. Say we breed out (could be contentious and say a number of things) certain traits now.......we are not sure of the impact further down the line.
Also the complexities of how things interoperate could easily mean that we inadvertently fix one thing and banjax things for later.
We are too young as a species to be playing around with this yet. But hey ho the change is coming anyway.
It's the human way. I was going to say "modern human way", but then I thought that what's modern is the scale rather than the issue itself. Fire, farming and writing come to mind as ancient examples of the same issue - the knowledge and power to do something that has profound effects without complete knowledge of what those effects will be.
I think it's possible that a certain level of knowledge/technology somewhere around humanity's current level might be the filter (or one of the filters) in the great filter hypothesis regarding Fermi's paradox.