Should Japanese police use their guns?

Yomiuri’s English edition has an article about the police response to the Akihabara stabbings [emphasis added]:
An assistant police inspector, 53, from the traffic division of the Metropolitan Police Department’s Manseibashi Police Station was tending to a man who had been hit by the truck when the suspect came up from behind him and stabbed him in the lower back.
Looking calm, the knife-wielding man glanced over the scene of pandemonium he had created.
Kato fled when another police officer carrying a baton approached him, running, waving the knife from side to side, counterclockwise half way round the crossroads. As shoppers bolted, the suspect stabbed one after another from behind before running off to the south.
[...]
A sergeant from the station’s Akihabara police box caught up with the suspect about 50 meters from the crossroad and thrust his baton at him, but Kato then ran into an alley.
The sergeant, 41, seeing that the man was holding the knife in his right hand and offering resistance, edged closer with his baton raised. He drew his pistol and ordered the man to drop his weapon, at which point the fight seemed to go out of the suspect. He dropped his knife.
The Telegraph offers a bit more detail on the use of police batons:
Kato was struck several times with a baton by a police officer – to little effect – and was eventually subdued when the officer drew his handgun.
Based on these reports, the situation seems to have been ended by the police officer’s gun. Batons were practically useless, and in the case of the first officer who chased Kato, a failure to pull a gun on the murderer allowed further slashing and stabbing to take place.
Nobody wants Japan’s police to become trigger happy and start killing off criminals every chance they get. However, in cases where use of a firearm could prevent violent criminals from causing injury and death to bystanders, Japanese police should be encouraged to use their guns. When police see a man with a knife stabbing people, the first thing they reach for should be their gun – not a baton.

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