Why do so many people adamantly claim to be against marital infidelity when statistics about it show otherwise?

What brought me to this question was the (currently being edited) question from yesterday, where a married woman got drunk at an office party and made out with another man. The responses she got were hostile (many got modded for being a personal attack) and although the woman seemed humble about her mistake, the majority of Jellies were of the opinion that she did something terrible and inexcusable.

In “real life” and on the internet, so many people will profess to being against cheating, and give the impression that in their lives and in their opinions, cheating on a spouse is disgusting, terrible, and that they themselves would never do it. The word “righteous” comes to mind when I think of how people present their attitudes toward cheating. I am not advocating cheating, I am presenting what I see (or what I think I see).

Yet, statistics show otherwise. I just googled “statistics about marital infidelity” and there are a ton of surveys out there, too many to reference or link. The stats are pretty high- 40% was one of the lower numbers, with all kinds of data on men partners, women partners, etc. Of course, if you add “emotional infidelity” to that mix (some sites had stats on that) the number gets higher (presumably from people having relationships on the internet or otherwise being in love with another, without physically cheating).

Why do so many people adamantly claim to be against marital infidelity when statistics about it show otherwise?