In Jain dharma, allowing, encouraging, or supporting violence by another person can also create paap-bandh for you, especially if you knowingly permit it when there was a chance to prevent it. The degree of bandh depends on intent, effort, and involvement.

About the roommate killing an insect

If a scared roommate kills an insect and you:

• knowingly permit it, or
• suggest it, or
• hand over the means, or
• remain indifferent when you could gently stop it,

then some ashubh karma-bandh can happen for you too, because Jain ethics values ahimsa not only in direct action, but also in approval and assistance.

If it happened suddenly and you did not intend it, the bondage is generally less than direct killing, but still one should do pratikraman / alochana and repent sincerely.

What should you do after that?

You should:

1. Internally repent with true regret.
2. Do pratikraman according to your tradition.
3. Resolve not to support such violence again.
4. Practice more vigilance so similar situations are avoided.
5. If appropriate, remind the roommate gently that Jain conduct favors non-violence and alternative safe handling.

About keeping insect-killing cream outside the door

If the cream is placed to kill insects, then in Jain view it is still an instrument of himsa. Even if you are not killing directly with your own hand, preparing or arranging a means of killing can also involve paap-bandh, because the intention is violence.

So:

• Not directly killing is better than directly killing,
• but keeping poison/killers to destroy living beings is still not ahimsa.

Jain way of handling insect entry

Prefer:

• sealing gaps,
• using non-violent prevention,
• gently removing insects,
• avoiding harmful chemicals as much as possible.

In short

• Yes, knowingly allowing or supporting killing can create paap-bandh.
• Yes, keeping insect-killing cream out for killing insects is also spiritually harmful in Jain dharma.
• After such an event, do repentance, pratikraman, and a firm vow for more careful ahimsa.