On the whole BitCoin fans don't think that. Maybe some naive kids who got a lot of coins by being in the right place at the right time think that. If they do it will cost them dearly. There are perfectly rational people in the BitCoin scene, people who do research and don't throw money at companies that look shady as hell like MtGox did before it blew.
It's been said many times and it deserves to be said many more - MtGox had only been paying out cash with months of delays for about a year before they went insolvent. Their death was widely predicted about a year before it happened. MtGox also has a history of very serious security issues like the time they leaked their entire user database. Hashed passwords, Usernames, Email addresses, the lot.