there is no relationship between those people and islam.
why must islam pay for what those did ? ... They claim they are muslims however they do what is prohibited by islam !!!
Not quite...
Sura 9:
9:1 A declaration of immunity from God and His apostle to the idolaters with whom you have made agreements:
9:2
For four months you shall go unmolested in the land. But know that you shall not escape God’s judgement, and that God will humble the unbelievers.
9:3 A proclamation to the people from God and His apostle on the day of the greater pilgrimage:
God and His apostle are under no obligation to the idolaters. If you repent, it shall be well with you; but if you give no heed, know that you shall not be immune from God’s judgement.
Proclaim a woeful punishment to the unbelievers,
9:4 except to those idolaters who have honoured their treaties with you in every detail and aided none against you. With these keep faith, until their treaties have run their term. God loves the righteous.
9:5
When the sacred months are over slay the idolaters wherever you find them. Arrest them, besiege them, and lie in ambush everywhere for them. If they repent and take to prayer and render the alms levy, allow them to go their way. God is forgiving and merciful.
9:6 If an idolater seeks asylum with you, give him protection so that he may hear the Word of God, and then convey him to safety. For the idolaters are ignorant men.
9:7 God and His apostle repose no trust in idolaters, save those with whom you have made treaties at the Sacred Mosque. So long as they keep faith with you, keep faith with them. God loves the righteous.
9:8 How can you trust them? If they prevail against you they will respect neither agreements nor ties of kindred. They flatter you with their tongues, but their hearts reject you. Most of them are evil doers.
A bit more from MUHAMMAD.
047.001 Those who disbelieve and turn (men) from the way of Allah, He rendereth their actions vain.
047.004 Now when ye meet in battle those who disbelieve, then it is smiting of the necks until, when ye have routed them, then making fast of bonds; and afterward either grace or ransom till the war lay down its burdens. That (is the ordinance). And if Allah willed He could have punished them (without you) but (thus it is ordained) that He may try some of you by means of others. And those who are slain in the way of Allah, He rendereth not their actions vain.
047.005 He will guide them and improve their state,
047.006 And bring them in unto the Garden which He hath made known to them.
047.035 Be not weary and faint-hearted, crying for peace, when ye should be uppermost: for Allah is with you, and will never put you in loss for your (good) deeds.
047.036 The life of this world is but play and amusement: and if ye believe and guard against Evil, He will grant you your recompense, and will not ask you (to give up) your possessions.
Possible interpretation? It is pleasing to Allah when you kill disbelievers, it is how he is testing your loyalty. You must not seek peace. Don't be afraid to die, because if you will die fighting disbelievers Allah will bring you straight into his Garden; after all life is but play and amusement.
Suicide bomber manual?