Perfect peace is ours in Christ Jesus regardless of the raging that may be going on outside of us.
The fact that the disciples took Jesus` passivity as a lack of care is telling. People who enjoy drama make everything worse than it is. They stir the pot. They are not so much interested in solutions as they are problems.
Jesus` calmness was because He knew who He was and that nothing could come against Him that His HolySpirit had not given Him the power to handle. The disciples were not so confident in the HolySpirit or even the man whom they were following who had performed great healings, miracles and deliverances.