I have heard both sides of the arguments already, I dont think that I or anyone can pasken on this. Something like this needs a gadol.
On one hand it might be a Mitzvah, on the other hand it had a direct result in the death of Jewish people as well as has angered a lot of nations which in result has cost many Jewish lives.
Besides, there might be other issues such as the Shalosh Shevous. Something like this, needs someone big to pasken.