No. In Jain dharma, a śrāvaka should not be indifferent to violence just because a Tirthankar is spiritually untouched.

A Tirthankar, being fully established in vītarāgatā and inner ahimsa, does not become disturbed inwardly by bodily harm. But the act of beating is still himsā, and it is still wrong.

So a śrāvaka should:

• not feel hatred or revenge,
• not create more violence,
• but try to prevent the harm with nonviolent means if possible,
• and act with compassion, restraint, and right intention.

The key Jain point is:

• The Tirthankar is unaffected in soul-consciousness.
• The attacker still accumulates grave karma.
• The śrāvaka’s duty is not passive neglect, but disciplined, nonviolent protection as far as possible.

So the correct understanding is not “do not get involved,” but rather:

“Get involved only in a way that remains faithful to ahimsa and compassion.”