America's Supreme Court - powerful, politicised, and unpoliced

Joe Biden - that's President Joe Biden - has said the Supreme Court is "not normal". He's referring to the recent judgements the 9 justices have made - overturning Roe v Wade last year, overruling affirmative action policies at two US universities, refusing to allow the government to cancel student debt, and wading into LGBTQ+ issues on a spurious basis of complaints that don't even exist. Is this overreach? Or is this the logical consequence of the polarisation of America?And who polices the Supreme Court?