-unless you have a really really really large investment in BTC, BTC won't bring you as much profit as the best alts that have not already been too pumped up will
This I definitely agree. The best way to gain profits or increase your BTC is investing in good alts.
-if you chose good alts, you have nothing to panic for! If you don't trust you chose good alts, you shouldn't have invested in the firyt place
They probably trust the alts they bought. The panic was probably due to them buying alts at a high price with all (or most) their funds.