i don’t need to present an alternative to glueing yourself to things….

I've had this kind of talk a lot of times. And when it actually comes to "those alternatives", which critics say activists should pursue instead, one common reaction is silence, as they are lacking ideas about those.
I'll leave you with that.

the jury is not out on that…

As far as I know, it is. If there are new studies, which I don't know of and which come to a clear conclusion, I'd be thankful if you could link them here.

and i don’t really care about your opinions pretending like you’ve read research about how effective gluing yourself to things it….

Well, that's your decision. If you don't believe in facts, then don't. But then it's not surprising if people call you out on that, if you don't provide proof for your position.
If you're interested – which you don't seem to be – I'll happily share the studies, historical examples, reports and surveys I've collected on that topic.

it’s honestly pretty fucking evil of you to promote it.

I didn't promote it. Maybe you can explain what gave you the impression?

nobody should hurt themselves to spread your political message.

I agree that nobody should hurt themselves. Although I can understand if people see themselves driven to such measures out of desperation and/or in order to prevent worse.
Regarding that activist group "Letzte Generation", I couldn't find any reports about injuries due to glueing.

Also I wonder where you get the "your political message" from as I didn't make any statement about my political stance on that.