You're obviously not basing that conclusion on polls, which have Sanders consistently beating Trump in battleground states and second in the primary only to Biden, whose numbers are plummeting every time he opens his mouth. Polls also show stronger support for socialism compared to capitalism among likely Democratic voters, based on whatever the poll participants take those terms to mean. They also show Sanders with the highest popularity of any candidate in the race, which continues the long trend of his favorability being high among politicians generally in America. All of his policies enjoy strong support among partisan and non-partisan groups, and are the benchmark that most of the other candidates are trying to position themselves around in some way or another.
The only people scared of Bernie's socialism are (a) stuck in the 1980's mindset of appealing to the mythical Reagan Democrats who never existed in the first place, or (b) actually against his policies because they harm their potential profits, and are concealing this fact by re-framing it as a concern about electability.