Adolf Hitler was not inspired directly by the Rig Veda.
In the 18th and 19th centuries, European scholars discovered that Sanskrit (the language of the Rig Veda) shared root words with Greek, Latin, and German, coining the term "Indo-European" language family.
Racist theorists—like Arthur de Gobineau and Houston Stewart Chamberlain—reinterpreted this linguistic link. They fabricated the myth that "Aryan" was a race of tall, blond, and blue-eyed Nordic conquerors, rather than an ancient linguistic and cultural designation.
Hitler and the Nazi Party adopted this European-centric myth wholesale. They falsely believed these "Aryans" originated in the North, and that ancient texts—including those in India—were simply the work of this supposed Nordic master race.
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The word Ārya does not indicate any race, either from outside or within India.
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Ārya was first used in Rig Veda. As Rig Veda is all about spiritual concepts, expressed in esoteric terms, the word Ārya should be understood in spiritual terms only.
In Rig Veda, the formless energy/BRAHMAN was referred to in different epithets,viz., AGNI, INDRA, Aryamān, ADITI, etc.
Ārya is derived from Aryamān, indicating an individual who realised his SELF.
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इन्द्रं वर्धन्तो अप्तुरः कृण्वन्तो विश्वमार्यम् । अपघ्नन्तो अराव्णः ॥
indraṃ vardhanto apturaḥ kṛṇvanto viśvam āryam | apaghnanto arāvṇaḥ ||
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I think, the Arya Samaj people wrongly interpreted kṛṇvanto viśvam āryam as "let us make the world arya".
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Indra as per Rig Veda indicates, the DIVINITY/Illumination of the Mind of the spiritual practitioner.
Ārya indicates the Illuminated/SELF REALISED state of the individual.
Hence, the correct inner meaning of the Rik shall be as follows:
Augmenting/Strengthening actively the divinity/Illumination of Mind (Indra) within and driving away all vices and weakness of mind, let us make the inner spiritual realm covered with DIVINITY/āryam.
