If Republicans refuse to call any witnesses, it will mostly help Democrats?

What do you think?

If they call witnesses, they are still going to acquit. But, they covered their bases and no one changed their minds. Their opinions are set in stone.

Howver, if they don't call witnesses, Democrats will call it a sham trial and most people agree with them, if we are to believe all the polls?

From a purely political viewpoint, Democrats may be better off if Republicans refuse to permit any witnesses.

Many Democrats are under the hopeful illusion that Repubs will change their minds if they hear from John Bolton or Mick Mulvaney. But that is not necessarily true.