There were much more than that picture but not as many as Obama's first inauguration. Who cares? Besides the media and then because the media made a big deal of it Trump had to make a big deal of it. It's pretty dumb and childish by both sides.
You're missing the point. The point is that it was FEDERAL EMPLOYEES (I like to call them *trolls*. Or *criminals*) who were posting the dishonest tweets. Not only was it federal employees doing it..it was the DEPARTMENT OF THE INTERIOR, who actually MANAGE the national mall.
So yeah, people care. We don't pay those fuckers to lie to the people. That is not their job. They are there to PRESERVE public lands. NOT to generate propaganda and lies and use federal sites to do it.