Are weak Hadith totally wrong?

If weakly authenticated Hadith should be left out………

The non-followers (Ghair Muqallideen) claim to act only upon rigorously authenticated (Sahih) Hadith and if there is even a slight degree of unreliability in a Hadith, they don’t accept it and demand a rigorously authenticated Hadith.  However, they also act upon Weak Hadith.  We are presenting some examples here, which will show the truth about their claim of acting “only” on rigorously-authenticated Hadith.