The problem with Trump is that he neither has the technocratic ability to manage this crisis, nor the charismatic ability to reassure the public. The crash on Thursday was driven in substantial part by Trump's absolute botching of the announcement of new restrictions, and probably part of today's crash is a reaction to the news over the weekend of the extra screening in US airports probably being counterproductive.
The image that the public is getting from Trump right now makes Hoover look good by comparison: it feels like Trump is trying to project an image of good handling of the crisis, and (belatedly) announcing measures to stem the crisis, but failing to actually follow through and ensure that the measures are actually being effective.
You say there are other people who can but this ignores the general corruption and lack of talent in this administration as well as the fact that Trump frequently gets in the way of the few people who are talented and trying to take helpful steps
https://www.economist.com/finance-and-economics/2020/03/16/t...