These are tremendous questions and ones that people are thinking about a lot.
I think there are a few issues and it's hard for me to do it all justice in a brief amount of time. But you're right, in that there are both the pros and the cons. There's clearly the chance that we might identify things that we didn't expect before. We might identify a genetic variant that might predispose to sudden cardiac arrest, where you intervene with a defibrillator and you save a life. On the other hand, you might find a genetic variant, and although that gene is linked to a disease, you don't know whether the variant you found in that patient will cause the disease. You may end up screening them, treating them, medicalizing them for conditions they may never develop.
There are lots of ethical issues about genetic testing in children or in adults for many of the reasons that the previous questions have highlighted, including insurance. We feel quite strongly as a community that we shouldn't be testing children just to give them information about what genes they might carry that would affect their offspring, for example, or to identify a gene that might tell them that they're going to develop breast cancer when they're 60, or Alzheimer's when they're 80. That's an adult's right to make that decision, not a child's.
We have to be thoughtful about those things.