Hafeez's right

In my personal opinion, Hafeez is right in raising inclusion not of
Sharjeel Khan, but tainted players because it defies the integrity of the
country over the fan following, which in the long run would hamper
national integrity.

I found a comment of Muhammad Hafeez where he was having questions on inclusion of Sharjeel Khan into competitive cricket, this is not the first time Hafeez has questioned a player on his return from a ban. In December 2015, he and current Test captain Azhar Ali stayed away from a training camp ahead of a tour of New Zealand because Mohammad Amir, who was returning from a spot-fixing ban, was picked to be a part of it. Both of them eventually joined training after the PCB intervened and have since played several matches alongside Amir.

What repercussion would it impact in the longer run?

It would host a threat on the national integrity that everything is allowed in Pakistan, you do a crime and than deemed to return after sporting a successful social-media propagation, read Salman Butt.