There is only one person who we can have control of – ourselves. See that you do everything yourself to be safe, wear a mask in public places, keep to social distancing, stay away from crowds or public events as much as possible. Adhere to the rules yourself and don’t worry about what other people are doing and thinking.
If you see someone close to you not wearing a mask say in a shop keep away from them, at least 2 metres. Don’t speak to them as this means they will breathe towards you and could spread the virus to you. Better have no contact or communication with them.
If you are in a shop and the cashier has no mask or there is no plexiglass shield in front of them then go to a cashier/shop that has them.
As for people supposedly being able to obtain the vaccine on the underground market etc.
I wouldn’t lose to much sleep about them as only in a properly controlled medical environment will the most effective vaccine for you be provided, according to your needs, requirements and medical history and according to the medication that you may already be on.
As it says in the Kerias Shema If “you” listen and do the mitzvos and love Hashem, then He will do His part in preserving you!