Everyone is allowed to have their secrets. And snooping rarely turns out well. Unless he is some slack jawed loser who spends 12 hours a day watching lusty co-eds with only one hand on the keyboard-then yeah, you would have a right to your indigation. But he's just a regular guy who watches it once in a while. Because ALL men watch porn. A lot of women watch porn. Men, and some women, are very visual when it comes to sex. It's not evil. It's just sex.
As for watching old sex tapes of he and his ex-wife together, that would bother me too. But you never would have seen those tapes if you hadn't been looking into his private stuff.
By destroying his hard drive you are giving him the message that he is not allowed to have any part of his life that is his alone. You are trying to shame him into accepting all of your life views.
Some porno is arousing. Some is just creepy. But isn't it better to let him fantasize than be looking for the real thing in other women? If he gets aroused, aren't you the lucky recipient of that arousal?

As another poster has stated, and you yourself have admitted, you feel the need to always be in a relationship. Maybe taking a break is a good idea. Take the time to decide what you need to do to heal yourself so that your next relationship would be more harmonious.

And gals, if you feel jealous that your man watches it, here's a fun little game you can play. Tell him to dial up his favorite porn site and then tie his hands behind his back. Come back in thirty minutes, turn off the computer and untie his hands. The sex will be outrageous.

Say what you will-I can take it. But having a good sex life can only lead to better mental health. It's been awhile for me, but that's how I remember it. And if you don't want to watch porn-just look at the photos of some of the gorgeous naked guys. I do!