Do we need Natural disasters?

In one word I would say "YES". It has advantages, one is that it reminds humans that they are not the masters and that might make them behave little bit decently. If were no natural disasters, I am sure humans would have pruned the nature completely.

There is another tiny advantage of bringing the population down, but I am yet to see the result of this because people who dies in these accidents are usually in terms on 1000s++ which is nothing compared to billions++ population. Also if you take in to account the money that goes in to reinstate the affected people, it is not worth.

Needless to say that people affected from it this is insensitive, but in broader terms these these catastrophes should make us more responsible.