According to christians these natural laws were designed by god.
Outside the physical universe in a metaphysical way.
Free-will has nothing to do with it.
Free-will needs natural laws.
If you affirm that god acts in the world you have no way out of this dilemma. If you don't affirm that god acts in the world then you are not a christian.
God acts in the world continually in a metaphysical way. Every soul is created by him at conception. Sometimes there's a special act against natural laws that's called a miracle. But a miracle primarily has the purpose of something about salvation of souls.
Why God does nothing about natural evil? Actually he already did.
There's a Buddhist saying that if you want all the ways padded you just need to pad your feet.
God has padded us with immortality. Your consciousness, the higher levels of your intellect and will are not destroyed by a tsunami.
A tsunami can only give you some few minutes of pain and agony but can't damage your immortal soul. But your soul can be subject to an eternal dreadful state.