Problems like Corona are natural phenomenon and there is no need to bring in Saints to solve it. Everyone faces their own individual Karma. Scriptures say that the world is a very dangerous place to live in and so advice moksha. Saints understand and share pain of others and try to uplift them from Avidya by bestowing Jnana which gives strength to face all problems with hope and transcend them.
It is said that great personalities almost always accept voluntary
suffering because of the suffering of people in general. This is
considered the highest method of worshiping the Supreme Personality of
Godhead, who is present in everyone’s heart.(Bhagavata 8.7.44)
I regard them to be perfect yogis who see the true equality of all
living beings and respond to the joys and sorrows of others as if
they were their own.(BG 6.32)
Learn the Truth by approaching a spiritual master. Inquire from him with reverence and render service unto him. Such an enlightened
Saint can impart knowledge unto you because he has seen the
Truth.(BG 4.34)
One who knows the transcendental nature of My appearance and
activities does not, upon leaving the body, take his birth again in
this material world, but attains My eternal abode, O Arjuna.(BG 4.9)
After attaining Me, the great souls, who are yogi’s in devotion, never
return to this temporary world, which is full of miseries, because
they have attained the highest perfection.(BG 8.15)