That's not caring about security, it's just not wanting to get blocked by firewalls. I don't think you can seriously argue that pirate sites care about security when the biggest thing on a page is an adware-installing, fake "DOWNLOAD" button.
How does HTTPS help circumvent firewalls? I wasn't aware this was a feature. My understanding is that a firewall blocking file-sharing sites would do so whether the site was HTTP or HTTPS.
My point is that by using HTTPS, these sites have demonstrated a higher level of proficiency with security tools than many more popular mainstream sites. I agree the scammy fake download buttons are a problem though, but that's what ad-blockers are for...