At this case, I will presume that the only trusted coin is bitcoin. What are your thoughts on this? Do you agree with me?
Trusted by whom? Altcoins are trusted by (at least part of) their supporters as well. The main difference compared to Bitcoin is the much smaller number of people that trust in these altcoins.
It is correct that altcoins are generally viewed with more skepticism, because there have been a large number of premine and other scams related to them. However there are also serious contenders among them. The reason that even these coins fail to gain prominence is not related to trust issues. The primary reason is that Bitcoin is simply too dominant to allow for the existence of equally important altcoins. The network effect of Bitcoin as a first mover draws in all resources in terms of developer talent, liquidity, and market acceptance. Even for perfectly sincere new altcoins it is extremely difficult to withstand this effect and grow longer term.
ya.ya.yo!
There are people who haven't even heard of Bitcoin who wouldn't trust it because it's an unknown to them. Other people have heard of Bitcoin but know nothing about it, and don't know that altcoins exist.
In this community Bitcoin generally has the most trust, and the altcoins have progressively less trust as their market caps get progressively smaller.
The existing users are using it only because they have faith in it and bitcoin is better in compare to other coins, but we can't expect the same from the people have are not aware about bitcoin yet, as they may think that bitcoin is a scam.