No doubt the "truly innocent," which is in that small category of suspects interrogated,do feel that way,but it's those scared guilty ones that end up talking,thinking they can "talk their way out of trouble,"or somehow "out smart" an experienced Detective,who's already heard everything before.
It's really a lot of things,that make suspects talk/As the Detective in that video explains,"guilty suspects just want to tell their story.
The very intimidating environment of "police custody,"and the fact of someone wanting the whole thing to be over with as quick as possible,can,and does make a lot of suspects talk.Just short of making a confession,they end up making several "admissions" of guilt,and all of this "after" being read their rights.