Think given the stats against Silva as a manager , combined with the horrendous 3 month (third of a season) run last year and the fixtures we have had. It's not really knee jerk to have lost faith in him.
Essentially we are on the relegation zone with a manager who loses more than he wins, concedes from set pieces more than anyone else and doesn't seem to be able to drop players when they aren't performing leading to even more bad results.
Going by reactions on here and reading the majority of posts, this turn on the manager doesn't seem to be fuelled by a knee jerk reaction much like koeman or a hatred like allardyce. This is fans waking up and seeing it for what it is, knowing it won't get better and statistically more misery to come.