This "impure purity" is expected for both male & female celebs, though there are some differences and boys tend to get a little more leeway.
The celeb also tends to take the blame for their creepy fans. It's their fault for 'encouraging' stalkers, etc.
It's an impossible culture that chews people up and spits them out.
That said, SK undoubtedly pushes it beyond any sense.
The idol is blamed for the incident. For the state of mind of their fan. For doing anything that might incite jealousy.
Oh yes. Everything is a scandal in such a competitive society, where cover ups are rampant just to avoid scalndal. Take this article about Seo Yea-ji for example:
https://www.scmp.com/magazines/style/celebrity/article/31298...
I think they are working to change the cover up culture, as it's almost always represented negatively in dramas.