What is the YEC answer to the lack of shorter lived isotopes?

One can speculate on the reasons why the Creator may not have created shorter lived isotopes:1. Radioactive isotopes cause cancer. BBC NEWS | Health | Chernobyl's cancer world record 2. Making nuclear bombs would be easier if more countries could mine radioactive isotopes. Maybe the Creator doesn't approve of nuclear weapons.YECs would find it more difficult to answer the question "Why did God create isotopes with a long half-life" Was he not able to foresee that man would use them for war purposes rather than for peaceful energy? Will nuclear energy ever become absolutely necessary? Can't we just rely on energy from the sun?