I get your point too and agree that you can't give in to terrorists. The inauguration has the potential to be much worse than the 6th was. I see it is going to be a scaled down event and that there will be a massive security presence and Facebook are blocking the co-ordination of protest events from being organised through their platform.
Instead of one big gathering in Washington storming into the Capitol, what I'm guessing we will see are numerous incidents all round the country but indivudyall they'll be on a smaller scale than what happened at the Capitol. I expect the Trump followers will find another platform to use to coordinate but one that's less mainstream than Facebook.