In the first case, I read both as temporary states, and the only way to express it as a habitual state would be to make a more complex construction such as 'Joh

In the first case, I read both as temporary states, and the only way to express it as a habitual state would be to make a more complex construction such as 'John is an angry person.' As for the second case, I think the usual way to achieve that effect in English is to use a frequency qualifier, such as in "John is sometimes angry," to modify the transitory state into a habitual one.