So 1% of any force guarding buildings or the inauguration is corrupt. But most important, that 1% is unlikely to be concentrated at any one place. For each one who might help insurrectionists or assassins, there are 99 others there to stop them. And now it's widely known that they are there, so the 99 will not fail to act.
I think the extremists have ALWAYS claimed to have much larger numbers than they do. Sure, they may have 39% of the people generally approving off President Trump, but how many of those are willing to come to Washington DC at his behest? How many of the crowd outside the Capital were devoted (or stupid) enough to break in?
I think their ranks are going to fit in the federal prison system, and as more of them get arrested, their ranks will get a lot thinner fast.