you will always find that those that want to keep coins cheap for a while will tell you not to buy, or infact try to tell you to sell so they can buy in cheap themselves.
precious metal guys will also say that bitcoins are the devil because unlike 30 years ago when the only alternative to fiat hoarding was precious metal. which helped the precious metal hoarders know there would always be a future demand. suddenly now realise that not everyone will be converting to precious metals, making their heavy hoards less desired and demanded. and obviously less valued in the long term.
so you will always get many people saying why not to buy bitcoin.
take this guy. his first video was hating bitcoin because he is a precious metal hoarder and has no desire to ever buy bitcoin
http://www.youtube.com/watch?v=vRnP2Vj7ppwtake his own quote as gospel "never take anyones word as gospel, especially those who own it and sell it" so that alone is a reason not to favour silver over bitcoin. as he wants you to desire his silver more. and for a precious metal lover he seems to have looked quite deep into something thats not a threat to his metal hoard.
he goes on about how he has no emotions towards bitcoins. yet then makes a dozen more videos about bitcoin. i do not fear termites eating into my home, it is possible to happen. but i would not get emotional enough to make several videos and researching something that i think i wont want in my home.
couple weeks later.. he now has bitcoin and has confidence in bitcoin, but now wants to scare people about the alt currency litecoin.
http://www.youtube.com/watch?v=JI2LVH4JfV0the lesson to learn is those shouting propaganda have a hidden reason