if someone purposely clicks the flags on the Navbar,then you may fall in trouble.
Secondly most bloggers don't like the navbar since it does'nt give their website a required professional look.
Easy steps to remove the navbar in blogger template :-
1.Sign in to your blogger dashboard>click the 'Layout' button.

2.Click on the 'Edit HTML' tab

3 Now search for below line in HTML script
/* Variable definitions
4 Paste following code just above the /* Variable definitions
#navbar-iframe {
display: none !important;
}
5 And save the template.
You are done and the navbar is gone!