Why are character references allowed in rape trials?

I would have thought trials were based on the defendants actions that led them to being charged rather than biased opinions of friends/family who are biased and/ or rape apologists.

https://www.news.com.au/national/nsw-act/courts-law/bucks-party-attendees-to-learn-fates-over-horrific-gang-rapes/news-story/5068b8c6c2bedbac9af7c45c622ce4a4

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