If he is acquitted, he is not suspected any more. He is vindicated
The details may differ in Sweden, but typically in the West, "not proven guilty" is not the same as "proven innocent". Justice systems that do this are based on the idea that it is better to err and let some guilty people go free in order to decrease the number of innocent people who are wrongly convicted.
He may well be proven innocent, as you rightly point out, but there is a middle ground where suspicion might well remain.