Did Maedhros kill Laughter?

[Inziladun]

Originally Posted by Urwen

Yes,but he would have no reason to send plague if Maedhros never formed his Union. Therefore, Maedhros is to be blamed for death of Lalaith.

By that logic, it could be said that Aragorn, who by his use of the Stone of Orthanc revealed himself to Sauron, caused the deaths of untold hundreds or thousands of Gondorians and Rohirrim at the Battle of the Pelannor.
After all, if Aragorn hadn't done so, Sauron would not have set his plans in motion so soon, and the attack probably wouldn't have proceeded as as it did.

And what of Bilbo, who roused Smaug from his slumber? Smaug went on to destroy Esgaroth. Was Bilbo responsible for that?