"Without riot gear, that very difficult"
Then there would be the question, of why there was no riot gear, when riots or riot-like situation could be expected. And since this was a planned event - and protestors openly planned to storm it - then maybe there should have been some better preparation?
And crowd control is indeed tricky, but it is still standard procedure for police.
You have fences.
You have lines of strong policemen with shields and tonfa.
You have tear gas.
Watercannon.
Beanbag.
Taser.
And ultimately, if rioters are indeed shooting or preparing to do so: there are guns with the police, too.
Many others brought the point: there probably would have been rivers of blood, if the black life matters movement, would have tried to storm the capitol.