You would be responsible in such situation. You are always responsible for your actions of will. You would not be guilty, but you still would be responsible.

If Cuba were neutral as Finland was during the cold war, it would not pose any threat to the world peace or safety. As a Soviet base it was threatening USA and so it was a threat. Finland would be a similar threat to Russia, if your government invited the USA to have its bases in your country.

Putting business logic on on eplace as much as possible ist good because it is easier to overlook and to maintain. This however is only true for the source code.

If you can organize your project in a manner, where an automated system deploys the compiled or generated code to different places, you can have the advantage of logically centralized business logic, and the advantage of its distribution to many places. The horizontal distribution is relatively easy (clustering), vertical is still quite difficult - but not undesirable. It would be nice, if one line in my sourcecode would be automatically propagated to JavaScript in the Browser, compiled code in the middle tier and stored procedure in the Database.