Modern pirates are economically disenfranchised people (usually sustinance fishermen) that have had their livelihoods stolen by international conglomerates.

Even with the the murders, etc, they are multiple steps up the ethical food chain from slaver fishing ships, which are apparently totally legit businesses (TM) in the global economy.

I really don't see the problem with the term "piracy". I guess if you are a vegan and also 100% boycott Asia you might be able to cast a stone against 21st century pirates.