"Unnatural Selection" - they wisely blow up the Lantree, that's fair enough - the risk of eliminating the spread something nasty so permanently is better than placing a quarantine beacon that relays the message "Stay away, pretty please, with corn syrup on top." Yes, they could tow the thing and - because of some plot armor - the ship gets taken over by a baddie and a season seven sequel worth watching is born. How would they deal with the corpses, anyway? Open an airlock, giggle as they whoosh on out, then hope that the Borg, Lore, anyone traveling in a modified photon torpedo tube because it looks cool, et cetera, doesn't float on by at just the wrong time since the whole of outer space is clearly smaller than the distance to the local gut-belchin' buffet restaurant? The episode was rushing things a tad, but there are still some variables...
... also, how come they don't relocate the research center staff and deal with the carriers? The DNA-altering virus that rapidly ages is obviously something that can be perverted into a weapon more quickly. Not all the Lantree crew beamed down, but they all died from it so it's certainly spread as through air and/or touch, perhaps... If airborne, how long can this thing last after all the hosts die off? If by touch, then surely at least one person would not be touching any of the corpses after noticing long enough what everyone else was doing. Fortunately, neither Data nor shuttle that Pulaski fiddled around in were impacted by the space cooties, so it's not lingering on any interior surfaces. That would be bad.
Lastly, all this reminds me -- hopefully the station is well within Federation space, maybe near Armus's planet, because you know some enemy could waltz on in and have a field day with both virus and the gooey psyllium slick (available in orange, cherry, mint, and asparagus flavors) that redefines "sticks to your ribs"... Armus would probably be grateful for being picked up by some baddies and who knows what secrets it has, now that it's no longer feeling sad as it's found a new buddy to play with.