When one is overcome with body-ripping anger and unspeakable hatred about someone or something, it is liberating to give into that emotion and rip or break something to let loose that anger. One does not think of consequences in such a situation. It is totally understandable.
It was a rhetorical question.
Still, Pelosi usually has good political instincts. She knew impeachment was a terrible idea, pulled off a miracle in 2018 and has been ramming through the liberal agenda for decades. But when sitting close to Trump, at the SOTU or meeting at the White House, she always seems to make stupid moves like this.