Is an Inquisition evil? No, it is how grave sin, heresy and apostasy are identified and punished for the common good.

 [Wisdom 1:9]  For inquisition shall be made into the thoughts of the ungodly: and the hearing of his words shall come to God, to the chastising of his iniquities.

(Verses 8-9). He says therefore: For this reason , because the Holy Spirit has knowledge of the voice, that is, of all speech, one speaking unjust things cannot be hid from the Holy Spirit at the present moment, like those in Psalm 62:12: ‘The mouth is stopped of them that speak wicked things’. So in Hebrews 4:13 we read: ‘all things are naked and open to the eyes [of the Spirit]’; also Proverbs 16:2: ‘All the ways of people[79] are open to the eyes [of the Spirit]’. Neither shall the chastising judgment pass by, by taking no notice of such a one, that is, the one speaking unjust things, but chastising, that is, punishing; or chastising, that is, at one time taking the body and soul or all the evil works, words and thoughts; judgment, namely, in the future; ‘all things that are done, God will bring into judgment’, Ecclesiastes 12:14.

Into the thoughts of the ungodly, that is, concerning the thoughts of the ungodly in which the sin is less than in evil speech, inquisition shall be made, that is, an enquiry and examination by a judge, according to Psalm 10:6: ‘The Lord tries the just and the wicked’; Job 42:2: ‘I know that no thought is hid from you’.[80] And if there will be an enquiry into thoughts, how much more stringent it will be for speech; for this reason the text adds: And the hearing of their words will come to God, for the chastising of their iniquities, as if to say: not only for thoughts. And, meaning but, the hearing of their words, that is an examination, before God, as before the examiner and judge, will come, and for the chastising, that is, the punishment of iniquities that were committed by speaking unjust things; Genesis 18:20: ‘The cry of Sodom and Gomorrah[81] is multiplied and their sin is become exceedingly grievous’.

[Ecclesiasticus [23:34] This woman shall be brought into the assembly, and inquisition shall be made of her children. [35] Her children shall not take root, and her branches shall bring forth no fruit. 

[36] She shall leave her memory to be cursed, and her infamy shall not be blotted out. [37] And they that remain shall know. that there is nothing better than the fear of God: and that there is nothing sweeter than to have regard to the commandments of the Lord. 

St Binaventure :Chapter 23: V.7 continues on the theme of sins of speech.Sinners and revilers and arrogant men are tripped by their own words.

In vv.16-27: Sirach speaks of three  kinds of sexual 

sins: he begins by speaking of the man who indulges himself sexually alone, in masturbation.The fire will not go out, it will consume him. The sense is that this vice is like an addiction,indulging it makes it grow stronger.Secondly, the one who sins with just any woman,even close relatives (v. 17:  "to the fornicator all food tastes sweet"), will not stop until the fire burns him up. Thirdly the man who commits adultery thinks no one will see him.but he maybe caught,and punished in the streets of the city when he least suspects it.The woman,his partner,sins against God,against her husband,and against the children of such a sin. She lost all property rights she would have had from her marriage (cf. M.Sota 6.1.And the children cannot belong to the community 

(B.Qidd 78b).