I don't think Harris is extreme. Of the people he reportedly considered, I think she may have been the best choice.
That said, she absolutely encouraged the protests over the summer multiple times. And tacitly encourage protesters breaking the law. After a horrible week of violence in Minnesota the last weekend of May, Kamala tweeted out on June 1st "
If you’re able to, chip in now to the @MNFreedomFund to help post bail for those protesting on the ground in Minnesota", along with a link to contribute to bail out the violent protesters.
She also stated in an interview in late August after a summer that saw multiple violent protests and riots that the protesters "must not stop" and need to "continue the fight until we win". And warned that everyone needs to "
beware, that protesters are not going to stop before Election Day in November ".