We also know that there can be life without water. If there is any life on Europa in a possible ocean, then in the future mankind will find ways to kill and eat them.
Just see that we have now only 2% of fishes left in our own oceans compared to the beginning of the last century.
Already about one billion people on this planet are starving regarding official figures of WHO and Worldfoodbank.
So mankind is running out of food and where ever we find something new to eat, we will eat it.
Only a few century ago in the western world people were not eating much meat. Last century people were eating about 1-2 times per week meat.
Now we eat meat frequently, because we do not have enough other food left, so we must eat animals.
If we will find life on other planets and it is not an intelligent species nor humanoid, then we will probably eat it or turn it into food for our own animals that we eat.