Why did Einstein create an atom bomb?

Question: Why did Einstein create an atom bomb?
- Keywords:
- Royal Society of Chemistry: Find out more about:
  
  atom bomb
  
  einstein
Asked by Edward Cowley to Alex, Anaïs, Peter, Shreesha on 19 Mar 2015.
- Peter Maskell answered on 19 Mar 2015:
  
  he didn’t create the atomic bomb his theories enabled people to work out it was possible to create the atom bomb so they did.
- Shreesha Bhat answered on 19 Mar 2015:
  
  He did not, he wrote a letter to the then US president suggesting to speed up the process of atom bomb as he thought Germany was going ahead with the technology and may invent an atom bomb soon. However, he later regretted his decision!

Question: Why did Einstein create an atom bomb?