That's what Trump wanted and it was what he incited them to do.
'Hopefully Pence will do the right thing'. Now WTF do you THINK Trump meant if not for Pence to violate his oath of office and stop the vote certification?
No, most were not 'let in'. There is way more film showing where they overpowered the police and broke in. Newly available videos have confirmed as much. And the indictments are based largely on those videos.
Hospital records will also be used to corroborate injuries not inflicted in a 'walk right in'.