Should I make my cats stay outside?

It’s a brother and sister cat, and they both love being outdoors. They wont stay inside without escaping at least once a day, and I live with roommates who let them escape and will not chase them down. They also love to sleep and relax inside the house, but they will stay outside if I leave their food and water outside.

The reason I don’t want them to be outside is because of flees and stray cats come and eat their food so that I have to put out 4 times as much as normal.