Why can't past criminal history be used in court for a current trial?

Anonymous
Amazing a guy convicted of same type crimes 10 times before , can not be used in a current trial. It shows past history and operation. So , if he has done it 10 times before , you can bet he did it for the eleventh time. When you go for a job interview , the employer wants to see your past experience , so if you have done a good job last 5 jobs , he can assume you will do a good job for him. What is the difference. ?
Why cant past criminal history be used in court for a current trial?
I also love how perfect people are when they get arrested for crimes. Family describe a saint , and when you look into their history , they have conviction sheet as long as your leg. But that was all just a set up by the man to trick these people into committing crimes.

One example was George Floyd. I mean yes he was killed and cop was wrong, but don't put him on a cross next to Jesus. He wasn't father of the year. He didn't help old women across the street. He took drugs. He assaulted people. He kicked his pregnant girl friend. He had a prison record. I mean when will he get a star on Hollywood walk of fame? They have a worship statue already.
Why can't past criminal history be used in court for a current trial?
3 Opinion