Is VISA Necessary?

People are required to have VISA to enter into ones country. But is VISA necessary? Does it not violate human rights to move freely?

It is true that there is no dangerous animal as man in our planet and that the crimes committed by man are highly destructive compared to other animals. But this can be controlled through the traveller’s identity, the passport. Why then  humans are allowed  less right than other animals like birds, wild lives, etc, which can move freely crossing borders?

No divine power decreed man not to move throughout the world. Man is born free and should move freely as long as s/he affords the cost of moving. There is no valid reason man ought to spend her/his precious time for the sake of getting VISA in embassies.

In my opinion, I don’t see the necessity of VISA except passport for people travelling abroad. If it is necessary for reasons I don’t know, it should be done at the airports of the country of entrance.