I use PP because it is a good business and a great convenience for online transactions.
I do not like their anti-gun stance. But, sadly, they are no different than many-many other corporate entities in the U.S. We would handicap ourselves trying to boycott all anti-gun companies. I would if I could, but it just isn't practical.
I have sold and purchased gun related items and paid, or have been paid, via PP. Simply list the item as "merchandis" and the snoop computers will not intercept the transaction.