Because this government decided it was a problem, then chose to look the other way when Cummings ignored these rules. Countless people have been forced to let their loved ones be buried or cremated without traditional ritual closure, or have not been there through the last days of others, all because the government convinced them that it was the right thing to do for public health. Maybe it was, but it should strike a nerve when someone professing these guidelines ignores them for a much sillier purpose and is lauded for his "integrity" and qualities as a "father." Were those ordinary Britons bad sons, daughters, siblings, and parents for not evading the same rules for their loved ones? Did they act without integrity?
A funeral, attended by many people, is rather different than a drive and walk through nature with the people you live with. Anyhow, the hypocrisy angle makes sense. Two strikes for everyone involved: one for coming up with the stupid rules and two for then breaking them themselves/covering it up.