On the "Was Epicurus Arrogant" issue, probably this text reference from Cicero's "On The Nature of The Gods" is relevant:
QuoteHereupon Velleius began, in the confident manner (I need not say) that is customary with Epicureans, afraid of nothing so much as lest he should appear to have doubts about anything. One would have supposed he had just come down from the assembly of the gods in the intermundane spaces of Epicurus! “I am not going to expound to you doctrines that are mere baseless figments of the imagination, such as the artisan deity and world-builder of Plato's Timaeus, or that old hag of a fortuneteller the Pronoia (which, we may render ‘Providence’) of the Stoics; nor yet a world endowed with a mind and senses of its own, a spherical, rotatory god of burning fire; these are the marvels and monstrosities of philosophers who do not reason but dream.