only human could be example for human. God is not human. God knows it all we don't so, for example, how could we judge people? Prophets are servants of God. they are examples for human. let me give you an example for this;
there's this story about Lut SAW and his tribe. he warns them many times but they would not care and threaten him instead. then angels come along to Lut SAW an tell him those people would be destroyed. Lut SAW is one of those who's an example for us...
11:77 And when Our messengers came to Lut, he was grieved for them, and he lacked strength to protect them, and said: This is a hard day.
29:33 And when Our messengers came to Lut he was grieved on account of them, and he felt powerless (to protect) them; and they said: Fear not, nor grieve; surely we will deliver you and your followers, except your wife; she shall be of those who remain behind.
i hope it at least gives an insight and you decide yourself. if Prophets were examples for us, should we destroy sinners or should we offer humane emotions to them?
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Shall I give you other examples?
008.065
YUSUFALI: O Prophet! rouse the Believers to the fight. If there are twenty amongst you, patient and persevering, they will vanquish two hundred: if a hundred, they will vanquish a thousand of the Unbelievers: for these are a people without understanding.
PICKTHAL: O Prophet! Exhort the believers to fight. If there be of you twenty steadfast they shall overcome two hundred, and if there be of you a hundred (steadfast) they shall overcome a thousand of those who disbelieve, because they (the disbelievers) are a folk without intelligence.
SHAKIR: O Prophet! urge the believers to war; if there are twenty patient ones of you they shall overcome two hundred, and if there are a hundred of you they shall overcome a thousand of those who disbelieve, because they are a people who do not understand.
009.123
YUSUFALI: O ye who believe! fight the unbelievers who gird you about, and let them find firmness in you: and know that Allah is with those who fear Him.
PICKTHAL: O ye who believe! Fight those of the disbelievers who are near to you, and let them find harshness in you, and know that Allah is with those who keep their duty (unto Him).
SHAKIR: O you who believe! fight those of the unbelievers who are near to you and let them find in you hardness; and know that Allah is with those who guard (against evil).
You know? If you're looking for justification, I think it's pretty hard to miss. Anyway, I think we've gone off topic a bit.