Yes because it's possible to reverse transaction on Paypal while it's not possible when you use Bitcoin .
So basically if you send someone to his paypal account , you can open a dispute and try to win the dispute and get your money back while the one who sent bitcoin can't do anything thing because it's irreversible .
Also people won't care about the transactions you made on other websites really because it's little bit hard to proove ownership of those accounts or if pictures are fake or not etc ... Western Union on the hand is little bit difficult to reverse so you may ahve better chances . [See the Currency exchange section] and welcome to the forums !