What if you owned: weed/drugs, illegal firearms, items which could be used for potential murder, negative opinions about the fascist government?

This argument is shallow to the point where fascism is what you're advocating here for. So what, if you did own something thats not law abiding - without any credible proof there is nothing there, and non of anybody's interest.

So are you saying you'd be ok with your personal property being searched without a warrant on the suspicion that you might own child porn?

???? classic statistic apologist rhetoric I'm not against holding pedos accountable, I'm against searching a man/woman/non binary's phone without proving suspicion of OWNing child pornography.. please educate yourself

What if I am a law abiding citizen? Should I relinquish my rights against unwarranted search and seizure because of 'woulda coulda shoulda'?

If your rights can so easily be ignored due to some hypothetical scenario, then you never really had rights to begin with.

Privacy isn't keeping everything about your life secret from everybody. Its about having control over who in your life gets to know what. Its the pretext for honest communication. Extreme surveillance will lead to people self-censoring themselves to please the fascist state.