Should you escape hardcoded URLs?

I'm writing a very simple social share plugin for a client. I'm using these two functions to display the share buttons at the bottom of each post:

?php
/**
 * Social buttons
 */
function zss_share_buttons() {
?
    div class=zss
        
        div id=fb-root/div
        script
            (function(d, s, id) {
                var js, fjs = d.getElementsByTagName(s)[0];
                if (d.getElementById(id)) return;
                js = d.createElement(s); js.id = id;
                js.src = https://connect.facebook.net/en_US/sdk.js#xfbml=1version=v3.0;
                fjs.parentNode.insertBefore(js, fjs);
            }
            (document, 'script', 'facebook-jssdk'));
        /script
        div class=fb-share-button data-href=?php the_permalink(); ? data-layout=button_count data-lazy=true/div
        
        a href=https://twitter.com/share?url=?php the_permalink(); ?amp;text=?php echo urlencode( get_the_title() ); ? title=Share on Twitter target=_blank rel=nofollow noopener noreferrer class=zss-button zss-button--twitterTwitter/a
        
        a class=zss-button zss-button--linkedin href=http://www.linkedin.com/shareArticle?mini=trueamp;url=?php the_permalink(); ? title=Share on LinkedIn target=_blank rel=nofollow noopener noreferrerLinkedIn/a
    
    /div
?php }

/**
 * Insert share button
 */ 
function zss_insert_share_buttons( $content ) {
    if ( is_single()  'post' == get_post_type() ) {
        ob_start();
        zss_share_buttons();
        $content .= ob_get_clean();
    }
    return $content;
}
add_filter( 'the_content', 'zss_insert_share_buttons' );

Is it necessary to escape the hardcoded social media URLs with esc_url()? As I understand it, if the URL doesn't have an input via admin, it should be okay.