How was it Tika/Malkhan's fault ?

The Indian Railways categorically mentions its passengers to not take any edibles offered by unknown passengers along with advisory that all the passengers should never leave their belongings unattended.

But this group did all that they should not have done. They took ladoos offered by the newlly wed couple. They also left their compartment and their belongings unattended. Even the purses of these ladies were left in the compartment only.