Everyone has uttered peaceful things in their life. Even mass murdering, racist, bigotted, woman beating psychopaths will have uttered some peaceful things in their life.
Using the dawahgandists tactics I'm sure we can even make it seem as though Hitler was a peaceful man.
A man came to Allah's Apostle and said, "O Allah's Apostle! Who is more entitled to be treated with the best companionship by me?" The Prophet said, "Your mother." The man said, "Who is next?" The Prophet said, "Your mother." The man further said, "Who is next?" The Prophet said, "Your mother." The man asked for the fourth time, "Who is next?" The Prophet said, "Your father."
Sahih Bukhari, Vol. 8, No. 2
When your mother has grown older,
When her dear, faithful eyes
No longer see life as they once did,
When her feet, grown tired,
No longer want to carry her as she walks,
Then lend her your arm in support, escort her with happy pleasure—
the hour will come when, weeping, you must accompany her on her final walk.
And if she asks you something, then give her an answer.
And if she asks again, then speak!
And if she asks yet again, respond to her, not impatiently, but with gentle calm.
And if she cannot understand you properly, explain all to her happily.
The hour will come, the bitter hour, when her mouth asks for nothing more.
Sonntag-Morgenpost, 14 May 1933.
You could have it the other way round as well - bad quotes by supposedly good people. Here are a couple of quotes from Gandhi
"Kaffirs are as a rule uncivilised—the convicts even more so. They are troublesome, very dirty and live almost like animals."
"We believe as much in the purity of race as we think they do... We believe also that the white race in South Africa should be the predominating race."
I wonder, why the usage of the term kafir?