Haven't finished watching the show but why is everyone so dumb

Characters constantly make the most brain dead decisions and it's so aggravating. Also aren't blood supposed to be like really strong? Why have all the ones that've shown up just been cannon fodder or just extremely weak? Like that old lady was supposed to have hundreds of powers but was just gunned down like it was nothing.

Like I like it when shows get me riled up and angry but this one does it cause of just lackluster writing and terrible character decisions