Yes you are right …it is actually Bitcoin is a name of trust…
Many other altcoins who were supposed to be a good project falls down to earth and drowned millions of dollars like Luna ,Celsius etc;
But bitcoin is never even imagined to do so…
Moreover it is for the reason that Bitcoin was the first cryptocurrency ever came into being…..when it falls other altcoins also falls and consequently when it pumps …other coins also pumps accordingly…the % change may be different for pump and dump but still Alts move according to Bitcoin…..