Why could Dharma enter the Island on Lost?

The reason everyone seems to be arrive on the Island by "accident" is because they are somehow drawn to the Island unknowingly. Most of the time, it is by Jacob. He met and touched many people who later arrived at the Island, such as Jack, Kate, James, Jin, and Sun, and before the second crash he touched Sayid and talked with Hurley. he also brought the Black Rock ship that had Richard on it to the Island. It is possible that the woman Jacob called his mother also had the ability to attract people to the Island.

DHARMA was able to find the Island because they developed their first station, The Lamp Post, which calculates where on the planet large amounts of electromagnetism appear. Its likely they knew to look for the Island because the U.S. Army had "accidentally" found the Island in 1954.

Well, Eloise showed them the Lampost, which is a Dharma station off the island. It is how they found it in the first place.

They don't HAVE to be brought there by accident. Some of the others came by choice, too.

All we know is that someone used the Lamp Post station to find the island and established DHARMA.

I wouldn't say they were "allowed". I think they ended the way they did because they weren't meant to be there. Kinda like messing with fate.

But they were able to with some scientific equations and being on frequencies and other physics jargon that I never really understood anyways.

they calculated it & i bet Jacob brought them there just like he brought everyone else. there are no accidents. except he keeps telling me that throwing me into the waterfall of light was an 'accident.'