Question about knight and bishop pawn forks.

Geez, I'm not very good at forums on a smart phone. Anyway, so the situation relates to a pawn forking a knight/rook and a bishop (or sometimes a knight and a queen). A specific example is this: White's queen is on h5. Black's knight is on f3 threatening the queen, but otherwise Black's king side is undeveloped. White's g pawn is on g6. The solution is to fork the bishop and rook. The knight on f3 takes the queen, allowing White to take the rook on h8 and promote. My question is why wouldn't the Bishop simply take on g7, ending the fork and developing nicely? It seems that all of these tactical solutions involve the diagonally attacking piece (bishop or queen) getting out of dodge, leaving the rook or knight to get gobbled up by the pawn. Often it seems that (and I will grant that I'm terrible at spotting double attacks, so the chance I've missed something is high) the forking pawn is hanging, so I'm frequently surprised by the suggestion because it seems like a sentient being would simply take the pawn with the diagonally attacking piece; but alas, it always runs (in these tactics puzzles anyway). Am I missing something big?

We posted at the time time, I'll delete this post because the next uses the additional info you gave.

If the only things going on in the position are what you describe, then you're absolutely right, black should take the pawn.

Often though in puzzles, there are other threats too. Take a look at this position with black to move. If black takes the pawn can you find a good move for white?