Here's something far-fetched for you; in 54 BC, plans were made and construction began on a temple dedicated to Venus in the Forum of Caesar in Rome. Then in 46 BC Julius Caesar himself vowed the temple to Venus Victrix on the eve of the Battle of Pharsalus. However, two years later he re-dedicated it;
He eventually decided to dedicate the temple to Venus Genetrix, the mother of Aeneas, and thus the mythical ancestress of the Julian family. The Temple was dedicated on 26 September 46 BC, the last day of Caesar's triumph. The forum and temple were eventually completed by Octavian.
It is thought that Lucretius must have died sometime in the late 50's BC. At any rate a letter from Cicero to his brother from February of 54 BC mentions Lucretius' poem. Caesar was assassinated in 44 BC, and Piso died in 43 BC.
I'm suggesting that there is a remote possibility that Caesar's Epicurean friends and relations (like Piso) might have helped to sway the decision. I would also observe that to vow a temple to a goddess of victory on the eve of battle, and then dedicate the temple differently after the battle was won would seem to suggest a somewhat lax approach to religion.
The temple itself was damage by fire twice, and restored and rededicated for the last time by Diocletian c. 283 AD. The three columns that still stand date from this restoration.