What really happened here: Members of this Palestine Action group sneaked onto a military base and attacked the aircrafts there. This act of politically motivated vandalism resulted in this group being officially banned by the government. Which is totally ok, no state in the world will and can tolerate some group doing acts of terrorism and/or doing sabotage.
Supporting banned terrorist organizations is of course also not allowed (which really makes sense) and yeah, this priest totally did that on purpose. You are therefore totally fine holding up a sign supporting Israel and you are also totally fine holding up a sign supporting Palestine, but you are not fine holding up signs supporting banned organizations.
Please tell me where you park your car and your number plate. I will then throw red paint on it. If a bit of paint can damage your car, why did you spend 40.000€ on it?
Just listen to yourself - of course throwing paint into an aircraft engine will damage a plane. This is exactly why this group did it. And there is nothing to prevent this - throwing paint will destroy every engine and esp. jet engines. If you do not believe me, throw a bucket of paint into your car engine. You can support Palestine, but please use your brain and try to think about some things before posting. You can do better than this.