Very high - I'll say 99%
Any species capable of traveling to Earth from another solar system would have the technology to wipe us out if they were so inclined.
But they would also have the technology have no reason to.
Aliens traveling to Earth with the express purpose of harming us would be like walking 50 miles to step on a caterpillar. We could do it, but what possible incentive would drive us? Caterpillars are as much a threat to us as we are to aliens.
It is possible that their actions might harm us. For example, they may be automatons that take resources from every planet they encounter, much like mosquitoes who bite any animal that stumbles by. But actions like this are not malicious - from their perspective the actions are peaceful.
Aliens with malicious intent would have to have an incredibly compelling reason to wipe us out. It's a long walk...
Read other answers by Dave Consiglio on Quora:
- What would you do if you knew that planet Earth is a place with no intervention for extraterrestial beings?
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Hypothetical Scenario: If Jupiter took the place of Earth and Earth became a moon of Jupiter, could we survive?
- Assuming we tie an unbreakable rope to the moon, can the earth population pull it to the earth?
from Quora http://ift.tt/1UVcCnS
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