I like choice but one could argue no choice is better. How many struggle with picking, then act like they regret that choice etc. So many want multiple acceptances but then struggle because of it.
But in theory a safety doesn’t mean guaranteed. Unless they have auto admissions for meeting certain criteria like the Arizona or Iowa schools, it is ‘possible’ one could get rejected by a safety - which in that case it’d be nice to have a second school.
Of course, there are various schools that even if left with no acceptances that are easy ins and available up to May 1 and even later.