Ever Wonder...

[Arwen1858]

Then how would Elrond have been different from Sauron in the long run? Sauron was guilty of inflicting his will on the free peoples of Middle-Earth, enslaving them and killing them. If Elrond had murdered Isildur, he would have been guilty of the same crime

I agree, for that very reason. I don't think Elrond should have pushed Isildur in for that very reason. Murder is murder.

Nor was Elrond's view of the future like ours of the past. Sauron was defeated; Middle-Earth had peace for a long time after the Ring was lost.

And since Sauron was defeated, Middle-earth wasn't in any great danger. For Elrond to push Isildur in would have been murder, and it would have been wrong.
Arwen