People need to stop nitpicking the terms Aryan Invasion Theory and Aryan Migration Theory.
AIT and AMT is just a semantic debate. There is no such thing as a formalized Aryan Invasion Theory. Aryan migration to the subcontinent is a fact of history. The topic at hand concerns the degree of violence and domination involved in the migration (all migrations involve violence to some degree). Aryan Migration Theory is certainly an apt name, but it is not right to discredit the term Aryan Invasion Theory, as an invasion is simply a migration with significant violence and domination. If one supposes that the migration indeed involved a significant degree of violence and domination, then Aryan Invasion Theory is a perfectly valid description as well. An analogous debate exists about the Anglo-Saxon migrations/invasions of England.