As mentioned by DR.N.V. Srinivasa Rao(#698580), The arrested person is just a suspect and are under trials and not proven guilty by the court. They might be innocent or guilty but unless the crime is proved, they are just under trial and as per our fundamental rights, every citizen has their right to privacy, right to live with dignity.
The covering of the face of the person under trial helps the court for a better look into the matter, avoid adverse publicity of the suspect, helps privacy, give a second chance to the person if the crime is less heinous and lastly helps their family to be undercover and save the brat of the public.
For first-timers, crimes committed under some circumstances, a crime under force, misuse of power, etc has to be taken into consideration as there are many petty criminals who actually commit a small petty crime for a living or the family and thus they can be eliminated from the public eye but criminals of heinous crimes like murders, rapes, terrorism, human trafficking, etc need to be made public if found guilty for the people to be well aware of such suspects or criminals.
“The most important thing in life is to learn how to give out love, and to let it come in." — Morrie Schwartz