Your examples are good, but my favorite example was the battle of Arginusae, a massive Athenian victory which directly led to the fall of Athens.
In the Peloponnesian War, Spartas army was supreme, but they could never defeat Athens navy. Finally they crushed it at Methymna, and blockaded the remainder, positionihg the Spartan navy to block trade with Athens and starve them.
Athens was forced to build a new fleet manned by inexperienced sailors, and appointed 8 strategoi to lead it against the now vastly superior Spartan navy. Using innovative tactics they won a great victory at Arginusae.
But immediately after, the Athenian commanders were unable to rescue survivors from their disabled/sink ships due to a sudden storm. The citizens of Athens, joyous at the amazing victory, now turned sour. The assembly voted to execute the generals. After they were executed, the war turned against Athens and many realized the mistake they made killing their best generals, so they brought similar charges against the instigators of the charges against the generals.
Pure democracy is a mob at work.