Wallace was sentenced to 80 hours community work and was placed on six months supervision and had to pay reparation of $250 for the damage.
In response to Wallace's sentence, group manager community facilities and programmes at Hastings District Council, Alison Banks said safety was a priority at the library.
"Staff and public safety is paramount and in particular ensuring staff are trained and supported in their place of work is a key goal. It is important to remember, however, that libraries are inclusive spaces and open to all members of the community."