That's quite a narrow way to look at it, to be honest.
There's probably hundreds, or probably thousands of police officers who approached danger and stopped it in a time where public were breaking rules and gathering in crowds etc. You say been in the media for weeks for kneeling on people's heads and tasering men at garages. They were isolated incidents and don't (I hope) represent the whole of the police force they work for.
Police officers deserve a pay rise. You can't not give it to them just because of the actions of one or two. Also, that police officer who knelt on the guys head (who was carrying a knife) was promptly dealt with so it doesn't affect him, does it?
That's like saying doctors shouldn't get a pay rise because of those that were responsible for the maternity scandal on Shropshire. Doesn't fit, does it?
The police do ridiculous amounts of extra work that doesn't get reported on. Think of all the domestic violence cases they tend to. The people who get stabbed and how they go searching and arresting these criminals. Everyone clamours for them to get paid more when they're the first people on the scene at terror attacks. Their penchant for running to danger, like fire officers, ambulance paramedics, instead of running away from it is commendable.
Also, nurses are exempt from this payrise announced because they agreed to one previously in 2018 for a set amount of years. I get the sentiment though given the risks they've put themselves on to in the current situation.
Supermarkets are in the private sector so wouldn't be included. They would get separate pay rises based on their company policies. They're not run by the government.
This isn't to say that I don't think they kept the country going. They of course did their part. But so did many others.