The only contradictions between Sirach and the rest of scripture can be found in your anti-Catholic prejudice.
Your religion is anti-Catholicism, and that precedes everything else in your faith.
In my prejudice you say? How about we look at the facts.
Sirach 12:4-7 “Give to the godly man, and help not a sinner. Do well unto him that is lowly, but give not to the ungodly; hold back thy bread, and give it not unto him... give unto the good, and help not the sinner.”
But Jesus says:
Luke 6:27 But I say unto you which hear, Love your enemies, do good to them which hate you, 28 Bless them that curse you, and pray for them which despitefully use you. 29 And unto him that smiteth thee on the one cheek offer also the other; and him that taketh away thy cloak forbid not to take thy coat also. 30 Give to every man that asketh of thee; and of him that taketh away thy goods ask them not again.
There are more but even the one direct contradiction of Jesus words should be enough to understand that Siach is not of God. In my prejudice indeed. It’s time Catholics come out of the deceitful heresy of Catholicism and understand they have been lied to.