What you are fogetting is the phrase in most jurisdictions "innocent until proven guilty"
Apply that to every nigerian prince's business proposal in your spam filter, I dare you.
When it comes to investing, particularly in the bitcoin realm, the presumption of innocence doesnt apply and is stupid beyond words. You should apply a presumption of scam until proven trustworthy.
I also always had an opinion "innocent until proven guilty". But the longer I am in the crypto-community the more I am convinced that here it does not fit .. Unfortunately ..