Tendency of officials to spot ball at 1-inch line instead of give TD

Has anybody else ever noticed it? I wonder if there's a psychological term for this tendency?

In case you don't know what I'm talking about, it seems to me that virtually every time there is a "50/50" call on a potential touchdown where the ballcarrier is kind of stumbling towards the goalline, or being tackled at the goalline, or diving into a pile at the goalline (especially where the ball isn't visible), the referees almost never give the benefit of the doubt to the side of "Touchdown". Which on it's face is kind of a mistake, since ALL scoring plays are reviewed automatically, and that would be sort of a built-in check for them.

If you don't know what I'm talking about - watch for this tomorrow or next weekend. I bet you'll see it happen 3 or 4 times in a day of football.