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I think there's a lot of missing the point here. The approach at this time shouldn't be "how can I justify continuing my life as normal and doing everything that I want to", because I'm sure lots of people can come up with spurious reasons even for continuing to do stuff that is clearly stupid in the current context; rather it should be "what do I absolutely need to do to keep body and soul together while minimising my impact on others until this is over". I don't believe that anyone needs to do a normal full-length training ride to stay sane, but getting some fresh air everyday probably is a good thing.
Olympians (generally) don't do their sport because they enjoy it or because it is good for their mental health, they do it because they are good at it.