Well, if we accept that the Narada
also made use of Borg tech, then maybe not.
Borg tech is obviously the fairy dust that explains the entire Abramsverse.
The Narada's techology origins aside, when it attacked the Kelvin, Nero & his crew as far as they were concerned did not know they were in the 23rd century.
They must have been confident of their vessel's capability to assume the Kelvin is a contemporary starfleet ship and went ahead to attack it.