Proof requires something more than what you can provide.
Proof, to you, entails something more than anybody can provide. More than I can provide, more than Islam's most eminent scholars can prove...
So statements like " Islam forbids the killing of innocent people" are simply lies to quell the fears are concerns on future victims of Islamic supremacy ideology and jihad.
More information is provided by William Muir's "Life of Mahomet", Volume I, footnote 88:
The common Moslem belief is that it is allowable to tell a falsehood on four occasions:
1st, to save one's life;
2nd, to effect a peace or reconciliation;
3rd, to persuade a woman;
4th, on the occasion of a journey or expedition.
To save one's life
The first is borne out by Mahomet's express sanction. Ammar ibn Yasir was sorely persecuted by the pagans of Mecca, and denied the faith for his deliverance. The Prophet approved of his conduct: - "If they do this again, then repeat the same recantation to them again." Katib al Wackidi; p. 227 ½. Another tradition preserved in the family of Yasir, is as follows: - "The idolators seized Ammar, and they let him not go until he had abused Mahomet and spoken well of their gods. He then repaired to the Prophet, who asked of him what had happened." - "Evil, oh Prophet of the Lord! I was not let go until I had abused thee, and spoken well of their gods." - "But how," replied Mahomet, "dost thou find thine own heart?" - "Secure and steadfast in the faith." - "Then," said Mahomet, "if they repeat the same, do thou too repeat the same." Ibid. Mahomet also said that Ammar's lie was better than Abu Jahl's truth.
To effect a peace or reconciliation
The second is directly sanctioned by the following tradition:- "That person is not a liar who makes peace between two people, and speaks good words to do away their quarrel, although they should be lies. Mishcat, vol ii. p.427.
To persuade a woman
As to the third, we have a melancholy instance that Mahomet did not think it wrong to make false promises to his wives, in the matter of Mary his Egyptian maid.
[This article provides more information on this incident.]
On the occasion of a journey or expedition
And regarding the fourth, it was his constant habit in projecting expeditions (excepting only that to Tabuk) to conceal his intentions, and to give out that he was about to proceed in another direction from the true one. Hishami, p. 392; Katib al Wackidi, p. 133 ½.