Activist Supreme Courts are not new. The Dred Scott decision in 1856, imposing slavery in free territories; the Plessy decision in 1896, imposing segregation on a private railroad company; the Korematsu decision in 1944, upholding Franklin Roosevelt’s internment of American citizens, mostly Japanese Americans; and the Roe decision in 1973, imposing abortion on the entire nation; are examples of the consequences of activist Courts and justices.
When justices seize authority from the other branches of the federal government, as well as state and local governments, under the rubric of judicial review, that’s tyranny.
The Statist veils his pursuits in moral indignation, intoning in high dudgeon the injustices and inequities of liberty and life itself, for which only he can provide justice and bring a righteous resolution.
Today, no less than five Supreme Court justices are on record, either through their opinions or speeches (or both), that they will consult foreign law and foreign-court rulings for guidance in certain circumstances. Of course, policymakers are free to consult whatever they want, but not justices. They're limited to the Constitution and the law.