I have a question about the movie "Signs" (2002) by M. Night Shyamalan, that bothers me for quite some time now.
For me, there is no sign (no pun intended), that the aliens are evil in any way. As far as I can see, they do not kill or hurt anyone deliberately. On the contrary: We only see humans hurting and killing the aliens.
Also, in every plot summary, it is noted, that one alien tries to poison Morgan. To quote Wikipedia, for example:
Merrill attacks the alien but not before it attempts to poison Morgan by spraying him with a toxin from its body.
But how do we know that this spray is really poison? Couldn't it be a remedy for Morgan's asthma?
So why do plot summaries assume, that the aliens are hostile? Is there any evidence?