In plain words
Holding this view, ruined in themselves and of little buddhi, they arise with fierce actions, enemies of the world, for its destruction.
Word for word
Holding to this view, ruined in [their] nature, of small buddhi, of fierce deeds, they arise for the destruction of the world, [its] enemies.
एतां दृष्टिमवष्टभ्य नष्टात्मानोऽल्पबुद्धयःप्रभवन्त्युग्रकर्माणः क्षयाय जगतोऽहिताः
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam· bhāṣya
एतां दृष्टिम् अवष्टभ्य आश्रित्य नष्टात्मानः नष्टस्वभावाः विभ्रष्टपरलोकसाधनाः अल्पबुद्धयः विषयविषया अल्पैव बुद्धिः येषां ते अल्पबुद्धयः प्रभवन्ति उद्भवन्ति उग्रकर्माणः क्रूरकर्माणः हिंसात्मकाः । क्षयाय जगतः प्रभवन्ति इति सम्बन्धः । जगतः अहिताः, शत्रवः इत्यर्थः ॥ ९ ॥
In plain words
This is the view they lean on, and standing on it they are lost — naṣṭātmānaḥ, their own nature ruined, the means of any better world beyond gone from their hands. Their minds are small; sense-objects are the whole of what they can take in. Nothing but small, that intelligence: that is what alpabuddhi means. And so they come up in the world — arise, appear — savage in what they do, cruel in what they do, violence not a mood in them but their substance. Read the words together: they arise for the world's ruin. Harmful to the world; enemies of it. That is the sense.
Close to the Sanskrit
Having propped themselves upon — that is, having resorted to — this view, those whose selves are lost, i.e. whose own nature is ruined, whose means for the world beyond have slipped away, of small intelligence — their range being sense-objects; those whose intelligence is nothing but small are 'of small intelligence' — they come forth, that is, they arise, fierce in deed, that is, cruel in deed, violent in their very essence. 'For the destruction of the world they come forth' — such is the syntactic connection. Harmful to the world, enemies: that is the meaning.