Perhaps
Pernicious perspicacity
Proselytized petulantly
Prevents
Progressive progress.
Perhaps
Pigheaded poppycock
(Palliative painkiller)
Prevents
Pursuit of peace.
Perhaps
Persnickety perfectionism
Practiced penultimately
Prevents
Principled personhood.
Perhaps
Passive people
Purposefully programmed
Prevents
Populous permutation.
Perhaps
Powerful people
Perpetuate peace
Personifying
Palpable prognostication.