I do not think ignorance is a defence in Miss Underwood's case. Surely any woman dressing in such a manner is doing so to inflame impure thoughts in men. She is not a child. I know modern society holds up the slattern as the ideal of virtue, but as she is not only conforming to this vile ideal but propagating it, she is perfectly aware, I am sure, of what she is doing.
Her own impure dress; and, from a quick look at the photographs, less than demure deportment, the loud, repetitive, rhythmic music and the dark close atmosphere make this a place inimical to virtue and repulsive to a Catholic conscience. You said there was a brawl? I'm hardly surprised.
And she might not know that any of those things aren't okay. The secular culture sucks people in young.
And when you don't have a well founded moral compass, gay marriage doesn't look all that wrong. It is wrong, of course, I'm not disputing that, but to so many people, it just seems like Christians want to deny gay people the ability to be in love and be happy. The secular culture makes a God out of self-centerness and happiness.