Weren't the campaigns launched against false prophets by Khulfa e Rashideen (AS) because of rebellion and their raising of an army against Muslims? Musailma Kazzab had claimed prophethood in the life of Huzur (SAW) himself, but Huzur did not launch a campaign to kill Musailma Kazzab.
Nope, infact, Muslims were aggressive, they send armies to defeat them and two of the so-called prophet i.e. Muslima Kazab & Sajah Al-Kahenah, aliened their forces to face muslim army.
There was Aswad Al-Ansi, who also claimedprophet-hood in the life-time of Prophet (SAAW), and order of his assasination was issued by the Prophet (SAAW). Infact, After the death of Prophet (SAAW), this was the only good news which came to Madina that, Aswad Al-Ansi has been assassinated.
The only reason Muslima was tolerated, is, Muslims were busy in the campaigns against the Roman empire and muslima was not a big force by any means, so he they can afford to have him around... anyway that strategy of the Armies..
Coming to the point, where Muslima and Aswad Al-Ansi claimed prophet-hood in the life time of Prophet Mohammad (SAAW), did Aswad or Muslima was called by the Prophet Mohammad (SAAW) to discuss it???
there were times when more than one Prophet was sent to people, these Prophets (AS) used to endorse each other, Prophet Loot (AS) and Prophet Ibrahim (AS) can be quoted as example. but we didn't see such kind of Attitude by the Prophet Mohammad (SAAW), infact he said, there is not going to be an prophet after me.. and yes he said that there'll be some Dajaals claiming prophet-hood, stead fast to the Quran and Hadees, ( i have quoted the hadees earlier in this thread)...
So back to the question.. with little ammendment
Why didn't Prophet (SAAW) had discussion with Muslima and Aswad Al-Ansi, as they both declared prophet-hood in the life of Prophet (SAAW), niether HE (SAAW) gave any instructions in this matte???
Why Did companions of Prophet (SAAW), straight away slained these Dajaals??