If cops are using it to metagame/powergame people with bounties I'll personally ensure they are taken care of because that isn't acceptable.
As for reasons it is primarily due to how cancerous decc' s in Sydney are with swarms of civilians in Sydney. People covering their identities made declarations nearly impossible to enforce and lead to either innocents being shot in deccs they weren't a part of or cops having a complete inability to keep the peace due to it being impossible to tell who half the people are. Outside of city limits it doesnt make such a big difference so they are allowed but inside city limits when you have 30-50 people swarming around in close proximity with varying degrees of armaments it was causing large numbers of issues for civs and cops alike and as such we have taken remedial action to see if it will improve gameplay quality in Sydney.
If you want a roleplay narrative to justify it the tyrannical government of altis ruled by Mr Blue, Mr Cinnamon donut and Mr Lesstza has rolled out spy cameras all through the city and to ensure they can monitor every citizen face coverings have been outlawed