Without prejudice to your opinion, I have a few observations in your post.
1) Aryans "coming" to India, either as invaders, dictators, exhortionist is wrong history spread around by Max Muellar and likes. This was because of two things. One, ignorance and two consipiracy. Things have started to unfold now and a clearer history is visible with appropriate evidences.
2) Ashoka was not a dictator or a tyrant and as far as my knowledge goes no written or folk history mentions this. Ashoka was a a Megalomaniac who took on wars to expand his kingdom and killed scores of people. The blodiest of all those wars was Kalinga war, the consequence of which changed his mind to Budhism.
Infact, Indian history at many instance says that you do not need to invade ro wage war to expand your kingdom. Mauryan dynasty was the biggest in size during the reign of Samudragupta Maurya (Ashoka's Father) who commanded entire South and South East Asia. but no major wars are reported in period. Infact, some scriptures in the SE Asia talk about his ability of negotiations and striking alliances through which we assume annexed so many kingdoms.
