Forgive me for being uninformed on this issue, but why did they destroy the resting place of Jonah? Wasn’t he believed to be a prophet in Islam as well?
ISIS are destroying mosques as well. Yes, Islam views Jonah as a prophet.
Many Islamists are extreme iconoclasts. The Saudis actually have destroyed many old historical muslim sites for this reason. These ISIS characters are even more fanatical about this and are rumbling about demolishing mecca itself. Guess they want to save the west the trouble.
because the could....after all the pervert prophet is the only one who can be venerated
There's a strong iconoclastic streak in some circles of Islam. Remember how the Taliban blew up those ancient statues of Buddha in Afghanistan, back in 2001? There's also an ongoing destruction of mosques and other historic sites associated with Islam, in Saudi Arabia by Wahhabi extremists.
Yes, the Muslims claim all the Old Testament prophets (and St. John the Baptist and Jesus) were "prophets of Islam". However, the hard-end Sunni position is that the veneration of places or relics associated with prophets is worship, and thus idolatry, since worship is due to Allah alone. Not all Sunnis take this position (many Sunnis make pilgrimages to the various sites associated with prophets and the Virgin Mary) but the position is within the bounds of normal Sunni Islam.
Shi'ites, in contrast, have always had a vibrant analogue of the Christian cult of the saints, and erect many shrines to their "prophets" and notable imams.
The contrast also extends to art. It is only the Sunnis who insist on absolute aniconism. Shi'ites publish illustrated biographies of Mohammed in which the "prophet' is depicted.
The Hajj itself is the only real exception universally accepted among Sunnis, and it seems that that universal acceptance isn't so universal any more. "Caliph Ibrahim" may well be taking the hard-end Sunni position to its logical conclusion. The Muslims have a prophecy that in the end-times the Hajj will become impossible. I'd always rather fancied that would be because finally the West had enough and nuked Mecca. It could turn out to be instead because the internal logic of Sunni Islam finally destroys the principal object of material veneration among Muslims -- the Kaaba.