“Stop and frisk is unconstitutional.”
Unfortunately while my own knowledge of the constitution is not great I do have a copy and I do look up things so I estimate that my own limited knowledge exceeds that of ninety percent or more of Americans, many of whom can “quote” things that appear nowhere in the document. I believe your comment on stop and frisk is correct but I would say that well over fifty percent of the population believes that whatever they personally favor is constitutional and whatever they disapprove is forbidden by the constitution.
You’re right; people feel the end justifies the means. The Fourth Amendment right to privacy is thrown out the window if it gets guns off the streets, and it is urban thugs being targeted.