– Is it desirable that such a site be permitted?
It may not be desirable to some, but I find it perfectly acceptable.
– Is it legal for people or groups to have such a site?
You’ll have to ask someone with a legal background, but the site domain is registered in British Columbia, Canada, and I presume that it meets legal requirements for that country.
– Should some official body remove their site from the internet?
No, under the assumption that freedom of speech is a concept that has worth.
– Are those who maintain the site committing a felony? Should they be prosecuted?
Bit redundant here, aren’t we? No, if the site meets legal guidelines, which it apparently does, of course not. The site does not appear to command any specific persons to carry out any specific acts, so if the OP is thinking along the lines of prosecution for incitement, IMHO he is incorrect.
– Does it matter legally or morally that ELF’s terrorism is aimed at property, not people?
Firstly, I’d be more inclined to consider it terrorism if they were setting SUVs on fire with people inside; OTOH, these are illegal acts of vandalism and should be prosecuted vigorously, particularly since there is a high probabilty that fatalities will eventually occur from actions of this type. Morally, I beleive this is a classic case of the “cure” being worse than the “disease”.
First few lines of registration info from WHOIS:
earthliberationfront.com
Registrant:
Thurston, Darren (EARTHLIBERATIONFRONT-DOM)
NO ORG NAME
PO Box 78061, 2606 Commercial Drive
Vancouver, B.C. V5N1G8
CA