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I actually agree with stationing guardsmen outside of DC for the inauguration. The fact is we don’t know what sort of intelligence they had so we can’t even speculate on any potential threats. I don’t know if 25,000 troops was too much but it’s completely fair to have some stationed.
Considering there were not even any demonstrations, it is fair to say the 25,000 troop level was excessive. It is very rare to have riots without an accompanying protest. The BLM riots for example initially saw many people protesting and a small percentage of them rioting (later many of the people "protesting" became de-facto human shields to the rioters, and as such were accomplices to the rioting). There were also thousands of people who attended Trump's January 6th rally, but only a few hundred actually went into the capital and only a handful of those people actually engaged in any violence (the rest merely went through 'breached' entrances.
To say that 25,000 troops are necessary is like saying that 500,000 people were expected to protest Biden's inauguration, which almost double the number of people who attended W Bush's 2001 inauguration, and this would be during a pandemic. If his inauguration were to draw that many protestors, I don't think he could govern legitimately.
The capital riots were the result of police forces being unprepared for a riot, and a few hundred people being stupid. It was not part of some kind of mass uprising.