Why was the roman consuls awarded the power of the veto?

The Roman Republic was created after ousting the Etruscan king, Tarquinius Superbus (Teraquin the proud). The Roman senate wanted to ensure no such dictator could reign in Rome again. The senate gave itself the power to veto outlandish laws, like "everyone must give Maximus all their money or else they will die". Its also just the democratic thing to do.