star wars - Why didn't all the Jedi at the Jedi Temple sense Anakin and his legion of Clones’ thoughts?

If you go back to Attack of the Clones, Anakin and Obi-Wan sensed that poisonous alien worms were about to kill Padme. Back in Revenge of the Sith, the Jedi could take on the legion or if there were too many, they could at least escape.

Answer

The Jedi at the temple were at a massive disadvantage. The most capable Jedi were offworld fighting leading the Clone Army and those that were left on Coruscant were the young, the elderly, a few guards, various Temple staff (librarians, mechnanics, slicers and such) and a few members of the Council who weren't in the building when the attack happened.

Once Order 66 was enacted, the Jedi were systematically gunned down across the galaxy over the course of just a few minutes. Those that remained alive seem to be suffering from some sort of Force-related shock at the change in the balance of the Force from light to dark. On top of that, the Clones aren't actually malevolent, merely following their orders dispassionately:

With the Jedi Order overextended, spread thin across the galaxy, each Jedi is alone, surrounded only by whatever clone troops he, she, or it commands. War itself pours darkness into the Force, deepening the cloud that limits Jedi perception. And the clones have no malice, no hatred, not the slightest ill intent that might give warning. They are only following orders.

_{^{Star Wars: Revenge of the Sith - Official Novelisation}}