Yes, love is a separate issue that may or may not be related to destructive tendencies. One of the primary intents and purposes of this play was to instruct Elizabethan children/youth in issues related to behavior and morality.
The lessons that should have been learned by those who watched the play included warnings about haste and poor-decision making as well as the dangers of disobeying one's parents.
There have been plenty of characters in Shakespeare's works who have been self-destructive without love being involved, and by the same token, love is NOT what causes Romeo and Juliet to self-destruct -- it was the manner in which they pursued it: in haste, in secret, and with deception.
This question has already been answered. Here is a link for you: http://www.enotes.com/romeo-and-juliet/q-and-a/does-shakesphere-seem-consider-self-destructive-52053
actually thething is that we can take this issue in two dimensions one could be THE TREGEDY OF FATE, while the oher is TRAGEDY OF HASTE. the former one is mentioned right in the prologue with the indication as STAR-CROSS'D LOVERS, while the later one perhaps is the self-destructivetendency. Romeo was quite hasty in love of rosline and more hasty in falling out of it. similarly getting married to juliet was the his mere haste and engulping the poision also, he never took a step to dig out the truth or talk to Friar Lawerance about the case.
therefore it can be said that infact this tragedy is the appropriate mixture of both. fate and haste, and therefore to some extent Shakespeare has shown the element of self- destryction and self- dishevelment.