Yes I do.
With all the gazillions of stars in the universe, it is naive to think Earth is the only planet that is inhabited.
It is probable that others are also inhabited and also probable that some are more advanced technologically than us.
It's therefore entirely possible that some of those more advanced races have developed a method of space travel that allows them to visit other planets.
So if just 1% of all the other planets in the universe are inhabited and just 1% of those are more advanced and able to travel through space, there would be more than enough to account for the sightings of UFO's.
The truth is out there...